User blog comment:Dude124/supermartian or superboy + wondergirl?/@comment-5014664-20120629144757/@comment-5149765-20120629220806

depnds on your definition of old, his physical age, his mental age or the number of years hes been alive. i think hes actually younger than wonder girl to be honest in years, but in physical age they are the same, so they are compatible.