You need to put it in perspective. This is supposedly around middle ages era.
The average life expectancy was 31 years and if you were lucky enough to live past 25 you'd reach around 45 of age.
Convert that to modern standards and he'd be around 45-60 somewhere in between there. So kind of old.
Huh, everyone's looking younger than I had imagined.
@fifthtouch
It is for highly physical careers such as sports, so it's a no brainer for life-or-death jobs like being an adventurer. The body does have a period where it is at its physical peak in the twenties, after after that it begins to decline and break down slowly.