"Heck, I didn't turn into a capable singer until my mid-thirties -- and it wasn't for lack of trying"

Exactly the same experience for me michaelr. I'm not sure wether it's simply a case of confidence coming with maturity, but I was a dreadful singer in my twenties. I'm not a good singer now but I do sing a couple of solo numbers with my band and provide harmonies where required.
My voice seems to be improving as I get older.
Can't wait to reach 50!! (not long now)

C-flat.