I think age is a matter of mind.... If ya don't mind...It don't matter. Id say after age 65 comes and goes you have your young days, and you have your feeling old ones more often. I shot 80# bows until i was 55 and had to turn it down a few notches after that. At age 68 my 60 pound bows wear me out quickly, and are not used very often. But.... i was fortunate to stay in pretty good shape over the years with very few shoulder and upper body strength issues.....But If ya dont use it, ya loose it. Now days it's my legs and lower back giving me issues. i have my good days, and my bad days.
But I don't think i'll ever wrap my head around being called an old duffer though. I'm still young at heart... Kirk