I agree with Zelane.
If it is a mid-life crisis, does that make it less real?

(Perhaps I don't know what a mid-life crisis is.) At mid-life I got a new job and seriously looked into genital surgery. I kept the job but decided I wasn't ready for the surgery. Was that a mid-life crisis? I was much happier after than before.
Now I'm looking to transitioning. I finally am in a place - geographically, socially, emotionally, etc. - where it is possible. Is this a delayed mid-life crisis?

Perhaps they are just asking you if you're sure you're doing this for the right reasons, which is a legitimate question.
Good luck, however you decide.

- Kate