They traded youth for substance. It's a good trade, imo. Pfeiffer is gorgeous AND a first class actress. Throw in Michael Douglas and it's easy to believe that Hank and Jan were founding avenger material. It also makes a retro adventure more likely. They can show antman and the wasp fight commies without time traveling. It's as faithful as it gets. Heck, bring agent carter along for the ride or Dominic fortune.