IDPA is great, keep it up! As far as what would remain respectable run times for you at 55 y/o, I can't quite say. Have your basics down, and practice often; speed
will emerge from that. You're not likely to outdraw a dedicated 25 y/o IDPA guy, but that's OK. Truly, you merely have to outdraw your street assailant.
Although we all slow down with age (and I'm older than you), we can largely compensate for that on the street by staying very alert and aware, and trusting the gut when a situation doesn't feel right. Just leave; you don't have to know
why it's not right. If you notice a Bad Guy before he notices you, you've already won. If you both notice each other simultaneously, then an armed well-trained/practiced Good Guy will likely win. Just don't get surprised by an Orc.
Finally, carry everywhere you go, even inside the home (if only a subcompact).
Choose a serious caliber, such as .40, 10mm, or a hot .45 P+.
"Green States are where I'd rather live!
Pack a gun so you won't get the shiv!
Scumbags headin' out so far and wide!
Keep Manhattan, just gimme that old Slabside! "
(Common Law Copyright 2025 by Kenneth W. Royce, All Rights Reserved.)
Thanks for the question, best of success to you.