Roger Aubrey has a super-soldier variant in his system which slowed his aging process considerably. He has been at least semi-active as the Mighty Destroyer ever since the war, as the leader of the V-Battalion. He was seen in action as Mighty Destroyer alongside Spitfire and Union Jack III as recently as the James Robinson INVADERS series.
The NEW INVADERS series by Allan Jacobsen also showed that he can still shrink down to Dyna-Mite size if needed...although its not a trick he uses often.