Just a few comments on aging and sailing,
I'm fast approaching 70 and like to think I'm still competitive, but I can't tack as fast and going to the wire takes a little more time.
The northsea junkie has got the right idea ,I take an Aleve before venturing out and it helps.I also use a steady exercise program of cycling, and gym work in the winter, to stay in moderate condition.
That said I race against an 84 year old in our fleet (6 A boats) who sets the standard in light air sailing here.