Board Thread:Questions and Answers/@comment-24.19.108.127-20150903174259/@comment-6331988-20151128000105

Based on Batman: Zero Year, Joker and Riddler are around the same age as Batman. But I'd say in the New 52, Joker is a bit older than Batman, so in his late 30s, and Riddler is a bit younger, in his early thirties.

However, for Pre-52, Joker and Riddler both seem quite a bit older than Batman, and Harvey Dent is around the same age.