You get what you deserve.
Maybe if we get a trilogy we can see him becoming older during the film, maybe in the first is young but many year will pass in the second and third installment if they make a trilogyI once joked about this in high school so I find it funny it came through a decade later.
Honestly, I'm neutral to it but I'm more concerned with the young Batman angle. I thought the older weary almost on the brink of failure take in Dawn of Justice was awesome and wanted to see it continue. Plus I wanted to bat-family to pop up so and that's easier with an older Batman than a younger one.
Granted there have been a few good takes on young Batman (beware the batman, Telltale, the one in the2000s, etc) so let's see what they got.
PS. Batman has fought vampires/werewolves before.
PSS. He also fought Thor at one point (comics are weird).
Gonna have to see more of it before I can give a final judgement. I remember when they first unveiled promotional shots of Joaquin Phoenix's Joker costume and I wasn't a huge fan until I saw it in the actual trailers and grew to really love it.