Batman Age?
I've noticed that people tend to stay young looking longer, at least in Hollywood today much more so than in the past.
In this film, it is emphasized that Batman is "young" and still figuring out how control his emotions and have Batman and Bruce Wayne coexist.
It is believable with Pattison, but he is 35 years old in real life, its not like he is 21.
Michael Keaton was only 38 in Batman 89, not that much older.
Christian Bale was the youngest at 31 during Batman Begins.
With Bale it makes sense because because Begins is an origin story, but Pattison definitely feels like the youngest of the trio despite the fact that he and Keaton were about the same age during their first Batman portrayal.