A free fitness age calculator that walks your VO2 max forward to 90, and walks what you want to do at 90 back to today.
5.0(1 rating)Answer a few safety questions, take five quick tests at home, and build your day, your food and your training from what you enter. It all stays in this browser.
General wellness education, not medical advice. Talk to your doctor before you change how you train or eat, especially if you have a health condition, take medication or are pregnant. Read the disclaimer
You at 90
Pick what you want to still do at 90. Each one walks back to what it needs from you today.
Inspired by Peter Attia's Centenarian Decathlon.
Your answers stay in this browser. Nothing is stored on my side.
This free fitness age calculator shows where your VO2 max heads by 90 at the average decline, and what a hilly hike at 90 needs from you today.
Add your VO2 max from your watch, or from NTNU's free calculator. If your Garmin gives you a Fitness Age, add that too.
What is a fitness age calculator?
A fitness age calculator compares your fitness with the average for your age. NTNU's calculator and Garmin Connect both give you one.
This tool adds the part they don't: your VO2 max walked forward to 90, and the tasks you want at 90 walked back to today.
Why VO2 max matters
In a study of 122,007 patients, the fittest group had an 80% lower risk of death than the least fit, with no upper limit found.
That's why Peter Attia trains it on purpose, with four zone 2 rides a week and one interval session.
Your VO2 max to 90
With no training, VO2 max falls about 10% a decade until 50, then up to 15%, by Attia's numbers. For someone at 45 at age 40:
| Age | VO2 max with no training |
|---|---|
| 40 | 45 |
| 50 | 40.5 |
| 60 | 34.4 |
| 70 | 29.3 |
| 80 | 24.9 |
| 90 | 21.1 |
A hilly hike at 90 takes a VO2 max near 30.
On that line, this person drops below it around 70. Keep training, and the line bends.
Your tracker's age
WHOOP, Oura, Bevel and Garmin each give you an age of their own, worked out their own way. Add yours on the Tests step, and the tool shows it next to your real age, with a link to how each company works it out.
Start where you are
Add your VO2 max on the Tests step, pick your tasks on the You at 90 step, and the tool shows what to train first. Then take the full longevity test.
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Fitness age calculator FAQs
Questions about the fitness age calculator? Here's what to know.
A fitness age calculator compares your fitness with the average for your age.
NTNU's own calculator gives your fitness age, and so does Garmin Connect if you wear a Garmin.
Add yours here, and this tool shows where your VO2 max heads by 90 at the average decline.
In a study of over 120,000 adults, higher fitness went with lower death rates, with no upper limit found.
Attia uses VO2 max to plan backward from what you want to do at 90.
No.
It's general wellness education, and it doesn't replace your doctor.
Talk to your doctor before you change how you train or eat, especially if you have a health condition, take medication or are pregnant.
I did.
I'm Navid Moazzez, and I made the fitness age calculator as one of my free tools on navid.me, from my own Longevity OS routine.
Read more about me.
Navid Moazzez
AI business strategist & AI OS builder
Navid Moazzez helps creators and founders master AI and build their own AI Operating System (AI OS) to automate their business and life.
Navid.me is reader-supported. When you buy through links on this site, I may earn an affiliate commission. Learn more.
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