I retired when I was 67 from a very stressful - but loved - job. My gift to myself was a volunteer stint in St Petersburg Russia -- unearthing a Peter the Great fortress for the Hermitage Museum and then Visiting quilters in the Baltic States.
My first day in Vienna I met a wonderful lady who borrowed my guidebook. She was backpacking - as I was -- and she had just come from Milan Italy. She was 84 and had 2 hip replacements. I thought --- If SHE can do it -- so can I!!!!
That was many years ago and I still use her as an example. Granted, I need more rest between hard work, but I still go for it. I volunteer as a docent at a museum one day a week and actually come home tired but enthused.
Old is a state of mind -- taking into consideration health issues.
Go for it!!!! Mim