Bill,
I understand the question posed by you is:
What is the youngest age of a male, that you would consider a real "MAN" !
But having had the opportunity to read and consider the responses made as well as you own addendums perhaps it could be better put, "What makes a man a "MAN".
I think the answer is both simpler and more complex than it seems. When you can look yourself straight in the eye, in the mirror, and be able to say out loud, to the guy looking back at you, that I don't have any regrets and I like the guy I'm looking at, then I think you are looking at the face of a "MAN", in that mirror. It sounds easy and maybe a little stupid and maybe a little simplistic, but its harder than you think, especially if we are really burying something we don't want to admit to ourselves. You can look in the mirror and think, for example, I'm a good provider or I'm a good father, but just thinking it will let the one half of the brain fool the other half into thinking everything's ok. I have had clients I whom I have asked to look themselves in the mirror and admit, out loud that they were an alcoholic. One guy told me he couldn't do itwithout holding his head with both hands to keep from looking away. Finally, after having really admitted it to himself he was able to begin to change. Admitting our flaws to ourselves is one of the hardest things any one of us can do. Being a man is being able to look yourself in the eye, recognize your flaws and do your d*mdest to change them. No one of us will achieve perfection but each one of us can do his best to be the man the next guy could count on and that man that anyone of us would be proud to call his friend. You can never put an age or a date or a time limit on that. I might have been a "MAN" before, but not be one today or I might be a "MAN" yet falter and fail myself or others on another day. I can only continue to be a "MAN" if I truly am trying to be the best man I can be. If we do that, then everything else falls into place.