Global Aviator,
Having an FAA ATP and air carrier experience is a real plus. And I'd
guess your age is more of an asset than liability.
Since you have an FAA ticket, what kind of flying were you doing when you got it ? Did any of the time count under FAR 121.436 ? It would speed up your ability to hold a captain spot at a regional.
https://www.law.cornell.edu/cfr/text/14/121.436