I can say that if there's some physically demanding
something you want to do, like a hard near impossible
hunt, or once in a lifetime trip, etc. do it while you're
young and resilient.
Even if you have to scrimp and sacrifice for months
and save up, then quit a lucrative job, do it and don't
look back.
I've seen way too many that were waiting for the
silver haired years and didn't make it or were too
far gone and had the re-re's the rest of their sad days