At 77 YOA I am most likely older than your Dad! He might listen to me, more than you?
The movies caused this fad, the small of the back holster, any fall or blow to this area of your body, whilst carrying this way, can cause very bad injuries.
No good at all for rapid deployment of pistol when sitting. Uncomfortable.
I have found the best general position for deployment/comfort/conceivability, to be just behind the strong side hip bone. There are many belt holsters on the market, I use a very low priced model, the Glock Sport/combat holster, for my Glock 19, weighs nothing, is low priced.
Not familiar with your pistol, keep safe.