Youth is happy because it has the ability to see beauty. Anyone who keeps the ability to see beauty never grows old.
If a girl comes to me first for a prom or a bar mitzvah and she likes the way she looks and her boyfriend likes the way she looks, she'll come back.
As a busker, one thing that does not work is self-consciousness. A busker needs to be working. A busker needs to shed all ego and get down to work. Play your songs, play them well, earn your money, and don't get in people's way.