There’s a sixth “Die Hard” movie in development, and it might be a prequel called “Die Hard: Year One”. And even though the first movie came out in 1988, and Bruce Willis is 60 years old, he still might star in it.
The idea is to have a younger actor play John McClane in 1979, and have “bookend” segments set in the present with Bruce.
This would actually be the second movie where Bruce and a younger actor played the same role. He and Joseph Gordon-Levitt did the same thing when Joe was assigned to his older self in the time travel movie “Looper”.