With age comes a greater context for the goals you're pursuing, the things you've already experienced, and all those random oddities that have made you the person you are now. I'm 27 today, and I'm welcoming it with open arms.
Age doesn't really bother me - lack of achievement does. In university I'd stress and frustrate myself by pandering about where my choices were leading. One of the biggest things I've taught myself though is that you do have to invest in what you're passionate about. Don't expect anyone else to do it for you, and challenge your own laziness. Needless to say, my optimism has remained intact.
To be honest, the first thing I associated with turning 27 was the 27 Club. It's the age that Kurt Cobain, Jimi Hendrix, Janis Joplin, Brian Jones, and Jim Morrison all died. Now that I'm the same age I can only further emphasize that it feels way too young to have a conclusion.