Originally Posted by
Chuckles1
Garmin is massaging our old egos; my fitness age is 25 years less than my age, but I dont believe it for a minute. I sure dont feel like forty! Then again, if you average in all the sedentary, overstressed folks, maybe somewhat realistic. They may be grading on a curve with very low expectations. We Americans are not exactly shining examples of health, generally speaking.
This is just telling you where you fall on the population distribution of estimated VO2max over age. If the distribution has any validity, I assume it comes from some Big Data source using the same estimation algorithm, i.e., Garmin/Firstbeat itself, which would be international and heavily biased toward fitness-conscious individuals.
Incidentally, I don't have a Garmin computer and don't know my "fitness age", but the VO2max estimates from HRV4Training and intervals.icu agree in my case.