Just checked and mine is working fine. Maybe try rebooting watch.

See attached link to make sure your vigorous miinutes are reaching the min threshold to be counted: https://www.garmin.com/en-GB/garmin-technology/health-science/fitness-age/

If you go into the app, and you go into intensity minutes (menu - ativities - intensity minutes -and you select 4w option - what are you getting as avg daily vigorous? If you multiply that by 7 to get an esimtate of weeks worth - how does that tie in with the value under fitness age?

Hi,

rebooting I will try.

Daily vigorous is 3min for this month and 5 minutes the month before.

But I always check that inside each workout of 30min or longer I have 5min consecutive vigoroius minutes because I ran into the same problem at the beginning of the year. I have 5 workouts a week and I always have 5plus minutes. 

It says at the fitness age-report that I have 0 vigorous days. That cannot be right.

https://prnt.sc/IuSJ2boh0aQI

https://prnt.sc/9VR7UmjMvyjl

The report also suggest to reduce my bodyfat which is already under 20 

SOLUTION:

It is a bug of Garmin Connect:

https://forums.garmin.com/apps-software/mobile-apps-web/f/garmin-connect-mobile-andriod/336811/my-garmin-connect-for-fitness-age-no-longer-shows-vigorous-days-even-though-i-log-plenty-of-minutes-per-week#pifragment-1286=2

Simple solution is to just manually reenter your weight and the fitness age returns to normal.

It worked for me!

I update every Friday and had the friday before. That is not what caused the issue. I had to manually reenter my weight and then everything was normal againb. Suddenly the vigorous days were not 0 but 5 as they should and my body fat was no "problem" after all. 

This is a little bizarre but as long as it can be solved that easy...

I have the same issue. My vigorous days are not counted. I updated my weight and it still doesn’t work… getting tired of Garmin