Right on, hale_bopp! It is true that many, perhaps most, inventors, artists and scientists do their greatest work before they reach thirty, but that is by no means absolutely true in all cases.
A book by Richard Bach called Illusions has a bunch of great one-liners in it. One of my favorite quotations is: "Argue for your limitations, and sure enough, they're yours." In my own case, I am true to myself whether or not my path matches what others or society expect of me. How can I be other than who I am anyway, even if I wanted to?
I sometimes wonder about whether or not I will ever be discovered and have one or more of my original songs actually make me some money. It is troubling sometimes to think that most musicians who "make it" are already famous in their early twenties. I turned fifty-one years old this year. While I have always been promoting my web site the past decade, just this past month I started actively looking for and participating in places to play my music publicly such as open microphone nights at restaurants and bars. This past month I have also played regularly at a metaphysical book store and at a coffee shop. It may soon reach the point where I will have more places to play than I have time for, but it's all about letting people hear my music (which is difficult for them to do when I am playing guitar while riding my bicycle).
As for fame and fortune though, if I was into my music to make money or get famous I would have quit long ago. When I was a teenager I may have started playing guitar to be cool or attract chicks, but the music quickly became an end in itself and not a means to an end. The older I get the more I realize how this relates a lot to the "meaning" of life. Good luck to you, and thanks for sharing.
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"When you ride over sharps, you get flats!"--The Bicycling Guitarist, May 13, 2008