Is 60 too old?
You serious?
If in good health, fit and haven't spent a lot of your life smoking what is the issue?
that applies if you are 16 or 80
No different if want to go hunting or climb a mountain...
Having not had a mask on since I was about 19/20..then 40 plus yrs on, swimming around the reefs..
After a little 'gentle , trial discovered how deep could go.. limitation was more from 30 odd yrs smoking althu haven't smoked for well over 10 now.. never got short breath or a cough etc..
With more practice, bit lung training Icould get down a little further and longer.. but not long or deep enough to warrant the expense of a gun....
If had not spent those yrs smoking, then I see absolutely no reason why I could not do so.. at Well over 60yrs
I think it like most things, from diving to motor circuit racing to hang gliding, regardless of age, if go at like a bull at a gate, you are liable to run into trouble, take it easy , push little at a time as experience kicks in ... go for it
My Uncle was climbing the Himalayas at 84..
There are a whole bunch of members on these forums doing this stuff way way over 60...