Something sort of like that happened to me, too.
My main growth spurt was around the regular age, about 14-15, after which I was about 5'11''/120 for a couple years. (REALLY skinny, I know.)
Then, between about 19-21, I added another inch of height, and got up to about 155lbs, with some new (& much desired) muscle, too. Wasn't working out, though, oddly.
Also, around that time, I got another inch or so on my cock, I think. (Not sure exactly how much, b/c I wasn't all that into measuring.)
Kind of wish I'd get another of those 'late growth spurts' now (I'm mid-30s), but I doubt that's going to happen.
Not complaining, though. I'm still about the same size I was when I was 22 -- that is, about 6ft/160. More muscle would be nice, but then, b/c I don't work out, that's probably my fault.
Just my 2c here.