I am working with someone on a major project right now...without making it too clear, let me say they are in their twenties and a highly professional type...fun, but completely capable of running the world without breaking a sweat.
Recently, her corporate email server went down for a short period of time and she had to give me her personal email address. I won't give the address here in full, but be aware that it contained the words "Bratty" and "Pants". Her explanation was "I've had it since I was 13 and couldn't bring myself to change it....".
Childhood decisions can chart your course in life. Choose wisely.
EDIT: Bratty Pants herself later confessed to me that she's not quite in her twenties. I can't tell you her age, but it rhymes with QWERTY. What can I say. I'm too smart to guess high. Always guess low.