HOTD was just a tour, so to some degree it doesn't matter if he's age-appropriate or innappropriate on stage, because people have already bought the tickets and will be in a certain euphoric mood, maybe with a bit of alcohol thrown in. So if he goofs around a bit, it doesn't matter as much.
But what I think Mike is saying is, people know he's in his 50's so if he's dressed like he wants to be in his teens or early 20's just to sell some records, that'll turn the public off as they'll think he's desperate to impress.
Pud
