100m times?

Hey, i was just ondering if anyone knows what is a good 100m time for under 20 age group? I ran 100m when i was younger and was clockin times of 12.54 when i was U15. I am now looking at re-joining athletics after a long injury, i am 19 and havnt ran for 3 years! What is an average or good 100m time for club runners? Its not going to put me off going back but i am interestied to know what i'm up against....Cheers