The 'Age Lines' thing is entirely cultural. Not much mystery to it, really. I can understand questioning these lines, but they are set by the culture in which they exist. In the U.S. (most states) you must be 21 to drink alcohol, but you must only be 18 to fight and die in war (or do any other job, for that matter). You only have to be 17 to watch fighting and death on a movie screen, though. These lines do not make much sense to me, but I know that they can be changed if enough people are convinced they should be.
As for identity, I totally agree with most of what you said. However, I think I might have a different definition of 'Identity' than you are using. I am me. That is my identity. Over time my physical mien may change, but I am still me. With experience and knowledge, my convictions and beliefs may change, yet... I am still me. My identity hasn't changed, but my 'self' has. I do know what you mean, though. I just wouldn't use the word identity.
As for identity, I totally agree with most of what you said. However, I think I might have a different definition of 'Identity' than you are using. I am me. That is my identity. Over time my physical mien may change, but I am still me. With experience and knowledge, my convictions and beliefs may change, yet... I am still me. My identity hasn't changed, but my 'self' has. I do know what you mean, though. I just wouldn't use the word identity.
