Guardians of the Galaxy Vol. 2 (2017)
Advanced CGI De-aging
4K HDR video
1) "Lola VFX" worked on de-aging Kurt Russell, having previously done similar work in other MCU films, they also work on various characters, including Nebula. To achieve the younger Ego, "Lola VFX" referenced Russell's performance in "Used Cars" (1980), as "he had a lot of the facial action there " that visual effects artists were looking for. They also used a younger stand in, Aaron Schwartz, since he had "big broad jaw, chin, and most importantly the way the laugh lines moved and creased as he talked", similar to Russell's.
2) Directed by James Gunn.
3) First film with de-aging is X-Men: The Last Stand (2006).