(Editors note: This article is part of an editorial partnership between Next Avenue and The American Federation for Aging Research (AFAR), a national nonprofit whose mission is to support and advance healthy aging through biomedical research.)
Are you as old as you feel, as old as you look or as old as your birth certificate says? The best answer may be none of the above.
Actually, you may be as biologically old as your blood says you are.
For many years, aging researchers have sought markers of biological age, or biomarkers simple signals that reveal the expected length of your future health. The expected length of future health, after all, is the key biological difference between younger and older people.
Some people have called such markers biological clocks. I dont know about you, but I dont typically calculate my age by thinking of clocks. I think of calendars. So, I prefer to call these hypothetical signals biological calendars.
The importance of these calendars is that they potentially allow researchers to quickly see whether a new drug, diet or other treatment that purports to slow, or even possibly reverse, aging is actually doing so.
Biological calendars of aging can also provide rapid feedback on how a lifestyle change, such as in diet or exercise habits, is affecting your biological age. This insight can motivate people to stick with that change.
Now, as a biological calendar, blood is a devilishly complex stew. Like a stew, it is liquid with lumps in it. We call the liquid plasma; the lumps, cells. Physicians for the past century have been using chemical analysis of plasma and counts of the various blood cell types to diagnose diseases. But we are now entering a brave new world of blood analysis.
Plasma contains not just the dozen or two chemicals that standard laboratory tests measure; it contains a constantly changing mixture of vitamins, nutrients, waste products, hormones and thousands of different proteins.
A hint that plasma might hold secrets about aging has come from research in which the plasma from young mice (or humans!) was found to rejuvenate the function of muscles, brain, heart and other organs of old mice. Dracula, it turns out, may have been onto something.
Recent advances in chemical analysis allow us to measure thousands of plasma chemicals at once, and advances in machine learning are helping make sense of that torrent of information. Plasma proteins may turn out to be just the type of biological calendar we are seeking.
I say this because a recent study of about 3,000 plasma proteins found that a specific combination of 373 of these proteins could accurately tell the age of the person from whom it was drawn. The study was conducted by AFAR Scientific Director Dr. Nir Barzilai with AFAR grantees David Gate of Stanford University and Dr. Sofiya Milman and Dr. Joe Verghese, both from the Albert Einstein College of Medicine in New York.
On top of that, people who were judged by their proteins to be younger than their real age scored better on a panel of physical and mental tests. We dont know yet how well these proteins might predict future health or life, but those studies will soon follow.
Blood cells, in addition to plasma, might have an even more promising aging tale to tell.
Your white blood cells (but not your red cells) contain your DNA, which provides the instruction manual for pretty much everything that goes on in your body. A few years ago, it was hoped that telomeres those protective DNA caps at the ends of your chromosomes from white blood cells might be a useful biological calendar. But telomeres as predictors of future health have not held up to scientific scrutiny.
However, we may have just been looking at the wrong part of our DNA.
Although we tend to think of DNA as little more than a long-coded sequence of DNA letters, there is a bit more to it. In particular, there are a number of small chemical tags that attach to DNA at specific sites to help turn off, or turn on, genes.
In recent years, combinations of particular tags called DNA methylation have, like plasma proteins, been shown to be good predictors of age and health in people and animals. These tags have even been shown to predict time to death and the development of later life diseases in people.
Perhaps even more exciting, a small, very preliminary study of 10 middle-aged men taking a hormone cocktail designed to stimulate the immune system showed a one-and-a-half-year regression in their DNA methylation calendar.
Lets not get too excited about this result yet. It is easy to overinterpret such very preliminary results, as some of the media have done. We have no idea at present what a small backward trend in DNA methylation age means, and this study has more than a few limitations. But it is without doubt provocative.
Stay tuned. Analysis of blood cells and blood plasma may hold secrets of aging that we are just beginning to discover.
Read more:
Does our blood hold the secrets of our longevity? - The Oakland Press
- Inside the longevity lab that aims to help people live longer - TODAY - February 27th, 2024
- I'm a longevity expert these are the 4 supplements I take every day to fight aging - New York Post - February 27th, 2024
- The Longest Living People In the World All Abide by the 'Power 9' Rule - GQ - February 27th, 2024
- Im a longevity expert and there's six things you should do daily if you want to live longer' - Daily Record - February 27th, 2024
- Reducing the metabolic burden of rRNA synthesis promotes healthy longevity in Caenorhabditis elegans - Nature.com - February 27th, 2024
- Presidio Federal's Thad Anderson Receives WashingtonExec's Longevity Award - WashingtonExec - February 27th, 2024
- Faces of wealth, intellect and longevity, as revealed by veteran face reader - The Korea Herald - February 27th, 2024
- I'm a longevity expert here are the best foods to eat for a long and healthy life - New York Post - February 27th, 2024
- Danny Care: 'Pilates Has Helped with the Longevity of My Career' - Men's Health UK - February 27th, 2024
- Give Me This Mountain | Tips for Spiritual Longevity - Harvest.org - February 27th, 2024
- Chris Hemsworth did a 4-day fast to reverse aging. His trainer played a cheeky joke to test his willpower. - Yahoo Canada Shine On - February 27th, 2024
- Pet longevity is a spark about to turn into a wildfire - Longevity.Technology - February 27th, 2024
- The Longevity of Bitcoin's Bull Run; Polkadot and Up-and-Coming Memecoin Draw Crowds - Analytics Insight - February 27th, 2024
- 'This is weird': Experts 'shocked' by record-breaking longevity of Death Valley's phantom lake - Livescience.com - February 27th, 2024
- Understanding the Longevity of SARS-CoV-2 Antibody Responses to Infection and Vaccination - Medriva - February 27th, 2024
- Experts agree: The fasting-mimicking diet may be the key to longevity - Longevity.Technology - February 27th, 2024
- Daily habits of a longevity expert : TED Radio Hour - NPR - December 30th, 2023
- Why does fruitcake last so long? Ingredients and preparation of the dessert play into its longevity - Fox News - December 30th, 2023
- Interviews of 2023: the longevity companies - Longevity.Technology - December 30th, 2023
- Nancy Wilson Discusses Longevity of Heart & Family Drama Within the Band Ahead of New Year's Eve Show in Seattle - American Songwriter - December 30th, 2023
- What Will It Take To Make Super-Aging Not So Super-White? - Well+Good - December 30th, 2023
- Arteta on Moyes and longevity in coaching | Quotes | News - Arsenal.com - December 30th, 2023
- New Years resolution guide: 5 steps to a healthier 2024 from a longevity expert - Fox News - December 30th, 2023
- Interviews of 2023: the longevity visionaries - Longevity.Technology - December 30th, 2023
- The Top 11 Longevity Tips Of 2023, From The mindbodygreen Podcast | mindbodygreen - mindbodygreen - December 30th, 2023
- Why LeBron James' longevity is unmatched in the NBA | Good Word with Goodwill - Yahoo Sports - December 30th, 2023
- Short vs long fasts: What is the ideal length for longevity? - Longevity.Technology - December 30th, 2023
- Centenarians share the secrets to living a long, healthy life - Fox Business - December 30th, 2023
- Rob Lowe on Turning 60 Soon & His Secret to Career Longevity (Exclusive) - Extra - December 30th, 2023
- Investigating the longevity and diversity of South Asian miniature traditions - STIRworld - December 30th, 2023
- The Silent Threat of Hypochondria: Impact on Longevity and Health - Medriva - December 30th, 2023
- Longevity: What lifestyle habits could help you live to 100? - December 22nd, 2023
- Aiming for longevity - Harvard Health - December 22nd, 2023
- How Long Can We Live? - The New York Times - December 22nd, 2023
- This Was the Year of Obsessing Over Longevity - GQ - December 22nd, 2023
- Menopause Age Looms Over Women. Efforts to Prevent it Could Extend Fertility. - Bloomberg - December 22nd, 2023
- Longevity: Is exercise the key to a longer, healthier life? - Medical News Today - December 22nd, 2023
- The #1 Sign You'll Live to 100, According to Longevity Experts - Gwinnettdailypost.com - December 22nd, 2023
- Cowboys Take On Dolphins, How Longevity Factors Into Hall of Fame Election and More - The 33rd Team - December 22nd, 2023
- Longevity Hacks Are Coming to Your Gym - WSJ - The Wall Street Journal - December 22nd, 2023
- 106-year-old woman shares hobbies, habits she says helped longevity - Business Insider - December 22nd, 2023
- Tips to Improve Your Health & Longevity in the New Year - KATU - December 22nd, 2023
- NN Group gets 13bn longevity risk transfer with Prudential and Swiss Re - Reinsurance News - December 22nd, 2023
- A fresh perspective on longevity - savannahmagazine - December 22nd, 2023
- Este Lauder targets age reversal with Stanford Center on Longevity partnership - Cosmetics Business - December 22nd, 2023
- Longevity means taking a proactive approach to prevention - Longevity.Technology - December 22nd, 2023
- Decoding Longevity: Centenarian Traits and Aging Research - BNN Breaking - December 22nd, 2023
- Brain Age: The Science of Cognitive Longevity - BNN Breaking - December 22nd, 2023
- The Role of Exercise in Longevity: A Holistic Approach to Health and Fitness - Medriva - December 22nd, 2023
- Get interventions to market and to people faster and cheaper - Longevity.Technology - December 22nd, 2023
- Humans Could Live up to 150 Years, New Research Suggests - May 17th, 2023
- The ingredients for a longer life - BBC Future - May 17th, 2023
- Life Expectancy by State 2023 - World Population Review - May 17th, 2023
- About Us - Fountain Life - May 17th, 2023
- Longevity: The Keys to Slow the Aging Process - Dr. Axe - March 29th, 2023
- "I got a 20-year contract. Giannis is going to play for 20 more years" - Mike Budenholzer on the longevity of Giannis Antetokounmpo and the... - January 23rd, 2023
- "I think Nadal has been doing a great job of that in the last four or five years": McEnroe believes Murray needs to shorten points for... - January 23rd, 2023
- Jon Voight is 'blessed' to have had such a long Hollywood career - Yakima Herald-Republic - November 7th, 2022
- USD Index to sink to 103 by end-2023 amid greater certainty and longevity of Dollar downtrend Westpac - FXStreet - November 7th, 2022
- Retirement Calculator | Northwestern Mutual - October 15th, 2022
- The Longevity Investors Conference Gstaad brought together longevity experts and deep-pocketed investors - Cointelegraph - October 15th, 2022
- Do you think ageing can be reversed? Here are 12 longevity startups to watch - Sifted - October 15th, 2022
- 'SNL' Gig Was a Risk Rob Lowe Credits for His Longevity: 'I Had People in My Life Telling Me - TheWrap - October 15th, 2022
- Wellness and longevity brand Serotonin Centers to open in Nashville - Tennessean - October 15th, 2022
- Lesley Stahl on longevity of '60 Minutes': 'That clock is still there' - USA TODAY - October 15th, 2022
- 4 Recipes With Corn, Beans, and SquashThe Three Sisters Ingredients That Blue Zone Centenarians in Costa Rica Eat Every Day - Well+Good - October 15th, 2022
- The Search for a Pill That Can Help Dogsand HumansLive Longer - WIRED - October 15th, 2022
- Supontis vs Dogecoin, Which Cryptocurrency Has Greater Longevity In The Market? - Coinpedia Fintech News - October 15th, 2022
- Louisville Zoo says goodbye to one of world's oldest gorillas - Evening News and Tribune - October 15th, 2022
- 'Prolong your lifespan': 5 'cheapest' foods that can boost longevity - Express - October 15th, 2022
- FOXO Technologies Announces First Distribution Partner and Begins Product Rollout in California; Expands Executive Team With Insurance Industry Talent... - October 15th, 2022
- Timeless: USM Arts and Sciences Faculty Members Ball, Meade Cite Love for Students, Teaching as Keys to Longevity in Profession - The University of... - October 15th, 2022
- The Best Workout To Slow Aging and Promote Longevity, Science Reveals Eat This Not That - Eat This, Not That - September 4th, 2022
- Share your story of loss or survival as part of The Longevity Project series on cancer - Summit Daily - September 4th, 2022
- Drinking two cups of tea a day is linked to boosted longevity - Women's Health UK - September 4th, 2022
- How the Asphalt Industry Can Improve Pavement Longevity - For Construction Pros - September 4th, 2022
- Longevity: Playing the Long Game in Ministry - The Gospel Coalition - September 4th, 2022
- Know 3 longevity secrets of the last USSR President Mikhail Gorbachev who died at the ripe age of 91 - Times Now - September 4th, 2022
- Tyrese Maxey Lauds LeBron James, Serena Williams, And Tom Brady For Their Longevity: "What Is In The Water Bron, Serena, And TB12... - September 4th, 2022
- 'There Should be Some Reward for Longevity in This Game'-Kiwi Pacer Wants Change In Central Contracts - News18 - September 4th, 2022