Marvel is sure a fan of face technology, having used it to make Michael Douglas look younger in Ant-Man and Hayley Atwell older in Captain America: The Winter Soldier.
Kurt Russell has been working with his own makeup man, Dennis Ledger, since Tango & Cash and 28 movies together later, the two of them are trying to make Russell look like he did when they first met.
Russell admits that some things were digitally touched up, but most of it was just makeup.
No shame in getting the digital facelift, but Marvel went for a more realistic look when it came to portraying a young man who was secretly a planet.