I'm 49, been shooting since 26, and have worn glasses since 40. The last nine years have been a constant hassle with the dang glasses. The problems were many: Fogging, sliding, glare, rain, interfereing with my anchor, tough binocular use, etc, etc, etc.
This past Christmas I treated myself to contacts for shooting and hunting. So far it has been great! I'm back to my old anchor and I'm shooting better than ever. Hunting has been really pleasant as well. I didn't realize how much I missed using bino's.
I still wear my bifocal glasses for everyday use, but the contacts go in when I string up my bow.