While I was enjoying Verlander's gem at Comerica last night my wife commented that there is no age limit for Jersey's these days. Back in my day (old timey voice) replica's were worn by children although they were tougher to find. The opines also seem to fall harder on men than women maybe it's a transition to your girlfriend wearing your lettermen jacket in high school, who knows. But the question needs to be asked, how old is too old to wear a Replica Jersey? Is it more acceptable/main stream now?
EDIT: Authentic or Replica's apply, anything that reflects what is on the field.