Never too old but depends on what and where you play. EDM, Rap and clubs are a young cats game. I don't want to be playing the latest iggy azelia song to a bunch of bettys However If you are playing rare groove in bars, then I say your age and experience (deep crates) is a bonus.
I was just wondering if A-Ko was still producing stuff the other day. This and the DJ Day Four Hills 12" are my two favourite records from melting pot.