Steve Rogers saved the world on multiple occasions, sacrificed his happiness and lost damn near everyone he loved. As such, it was difficult to begrudge his decision at the end of Avengers: Endgame to use the trip to return the Infinity Stones as an opportunity to travel back in time and live in domestic bliss with Peggy Carter, the love of his life. After taking the long way round to get back to the present, Rogers was an elderly man. Still, for someone chronologically pushing a hundred-years-old, he was in relatively good shape due to long-term effects of the super-soldier serum.