Same experience for me with the guitar. I really don't know why I waited so long. I picked it up in my 50s; I wonder where I might be now if I'd picked it up in my 20s.
Until I started learning something as hard as the guitar, everything I'd had to learn in the past had come pretty easily to me, so I didn't need to study hard in school, etc, but that meant that I just passed on the really hard things (like advanced math). I think I lost out on the life-lesson about how effective diligent practice is at improving skills. I might have tackled even harder things earlier in my life.
Well I don't have particularly high expectations of myself so I'm not sure how I'd define 'issues'. :) For me the dexterity is a learned skill just like memorising the chords/notes.
I think very young people might have an advantage in how quickly they gain the required dexterity. However I've usually associated a young person's ability to learn the guitar quickly with the fact that most young people have a lot of free time on their hands and they just spend a lot more time practising than a busy adult.
Unless you've got an explicit ailment (eg arthritis) I don't think age is a barrier. "Working man's hands" might slow you down a bit at the start. I guess I'm lucky to have "programmers hands" :)
Until I started learning something as hard as the guitar, everything I'd had to learn in the past had come pretty easily to me, so I didn't need to study hard in school, etc, but that meant that I just passed on the really hard things (like advanced math). I think I lost out on the life-lesson about how effective diligent practice is at improving skills. I might have tackled even harder things earlier in my life.