Lol. The last thing on my mind was the age of the cast members. In my mind, the events of all 5 films occur within a 2-year period after the first incident, despite the long gaps between films
Bannister and Scrimm are up there in age but it doesn't affect the storyline and shouldn't take away from the enjoyment of the movies. I've seen that teaser about a dozen times now and each time I do it makes me want to see the movie more.