I am 46 and just changed to 15 lb, not for any physical problems though
I was working on some timing issues and got a 15 lb in a raffle and tried it.
It helped my issues and now I switched them all over to 15 lb You dont sacrifice any carry at all
I dont notice it much unless i pull out an old 16 lb'r.
i still use a 16 lb yellow dot on the burn
Im a track fan, great stuff IMO
for the weak stuff, I have several "JET" balls, slick cover, and predictable
I ended up getting another one and drilled it pin down for the short sport.
I also just got a blue hammer replacing my natural, a must have for the old woods lanes I run into.