Your never to old, well it might be a little tougher if you were 60
Heck, I'm 50 getting ready to retire out of Federal Law Enforcement, and thinking seriously about it. I'm a 600 hour PP with Inst. looking at going to one of the 90 day +/- wonder schools. With my retirement I could afford more than ramon noodles as a first year FO

If nothing else I could do the CFI thing, and right now would probably make more than a first year FO.
At 43 you still have 22 years to fly with the new 65 rule
Bill