I wonder if DC has a problem with Damian's age (because they don't want Batman to be too old), why they don't make that Talia and the Assassins League has access to a place where time passes differently and Damian was raised there.

They may say that Damian was raised 10 years in that place, but it only past some months since his conception on earth.


This is literally the kind of explanation they used for Jon's growth. They could use this to explain Damian's age while mantaining Bruce relatively younger.