Yeah why study only running? Low impact exercise like swimming or cycling are just as vigorous without the associated damage to your ability to walk later on.
There’s always exceptions, I’m sure we’ve all seen geezers running around, but body weight obviously has a lot to do with it, as older people still running are universally skinny like concentration camp occupants.
They should put that in a drink. Some of us are too old to job but need help.
This is a study done with mice.