I'll hit 70 before the end of the year. I can still wade many of the places that I always have, but there are now more places that I won't try that I used to fish. My bad knee doesn't help.
I do NOT want to gentle into that good night; I am going to keep trying to do as many of the things I like for as long as I can. I don't want to become one of those old guys who sit around gas stations, barber shops, or bars who brag about how great a sportsman I was when I was young. (And,I have never been that great, though I am pretty persistent most of the time.)
So, I agree: GO!