Ken,
Good question, and Phill got it exactly right. ( at least in my head. )
I can think of many instances of people that never got the chance to achieve their dreams b/c some establishment type obstacle thwarted them.
Two that comes to mind right away were Robert Kennedy and Martin L. King, Jr, in their cases, by an assassin's bullet.
I think many young African American Musicians in the early years of the music industry who were robbed of their songs and $.
People that have spoken out on civil rights issues, whose ideas somehow get buried in the media or social prison ( I think of the women's rights movement)
Or more commonly, just a teenager that wants their own identity, wanting to break away from the authority of their parents, school rules, or other social norms.
(I know that there were many times I did stuff that I hoped and prayed that my Mom never found out about. 
)
Try to understand the kid that doesn't want to work the farm, or go to college, but wants to follow there dream of being an artist or musician.
( or someone telling Beamer to only play classical music, instead of METAL )
So this song just comes down to basically a young person being rebellious, and not wanting to be stifled in what they wanted to do or say.
As for that the last line in the first verse, it means ( at least in my head) that the young person would achieve that freedom before they get old and change-
and end up being part of the establishment. Thus the line before it - want to break the mold. (I think Pete Townsend wrote those famous words - " Hope I die before I get old! ")
The world would never have progress if there weren't dreamers that break tradition.
(Chuck Berry and Buddy Holly come to mind, musically)
My brother told me a story once about a little girl who was watching her mom cook a roast beef. The mother cut the ends off the beef and threw them away and then proceeded to cook it. The little girl asked why she did that. The mom said because that's the way her mother did it and it always tastes great. The next week the little girl visited her grandmother and told her what her mother said, and asked her why she cut the ends off the roast beef. Grandmother replied, b/c that's the way my mother did it and it always tasted great. The next week the little girl got to visit her great grandma. Sure enough she asked her, " Great grandma, My mommy and her mommy both cut the ends of the roast beef before they cook it and throw them away. They said it's b/c that's the way you did it. Can you tell me why ? "
Grandma smiled at her great granddaughter and said , " Sure, it wouldn't fit in the only pan I had".
This is just another reaffirmation that a song can be interpreted many ways.
Thanks for all the interest and the way you performed it. Hope this clears it up.
Jim