other movies that could really benefit from this CG deage thing (for the whole film)
Dirty Harry - Clint back chasing homicidal maniacs in 1970s San Fran
Indiana Jones - 1980s era Harrison Ford returns as Indy in the 5th movie set in the 1930s
Star Trek - William Shatner is back as Captain Kirk in Star Trek VII (set shortly after Star Trek VI/before Generations) also starring deaged George Takei and Walter Koenig. with CG resurrected cameos from Nimoy/Kelly. (also showing all new flashback scenes set in the original series and previous movies eras)
BTTF - Part IV set in the 1990s. deaged MJF as early 30s Marty with Christopher Lloyd as he is now (no need for CG)
Aliens - Sigourney Weaver and Michael Biehn deaged to their 1988 ages to redo Alien3
Terminator - the really real 'true' T3 with deaged Arnold, Linda Hamilton, Robert Patrick, Ed Furlong, Michael Biehn. set in 1997/2029. Directed by James Cameron.
James Bond - Sean Connery comes out of retirement as 40y old Bond set in early 1970s (followed by a 1980s Bond film with CG resurrected Roger Moore. a 1990s film with deaged Dalton. a 2000s film with deaged Brosnan)
Superman - Christopher Reeve is back (via Brandon Routh with CG dot markers on face) for the 5th film in the series set in the 1990s . also starring an out of retirement CG deaged 1990s Gene Hackman
Elvis - a CG biopic featuring a CG resurrection of The King at various points