Spent 41 years in catering mostly were 18 hours days are common
Now 66 got big health issues.
Being retired in do much exercise also lost 2 stone
Walk 5 miles every day & busy myself every day
It's your body you don't get another one
Do it, don't do it, it's your call
Don't have regrets what you could have done
Any consolation
There is loads of people out there 100 times worse off from you
Good luck
You are going to need it