Granted, Wolverine is nearly two centuries old in the modern day X-Men universe, so age will always be an issue with any woman he gets romantically involved with, but since visually it’s more noticeable between Jackman and Turner, Kinberg and the creative team decided to set that element of the original story aside.
On the other hand, while there’s only a four-year age difference between Hugh Jackman and original Jean Grey Famke Janssen, Jackman and Sophie Turner have nearly 30 years separating them.