Sounds like a serendipitous find there! Sorry, I just like that word...
But on the age I wouldn't give it a thought at all. The design was already fully refined by then from the original. Sounds like the other gent got the gun, simply didn't like it. He hoped that maybe a pro trigger job would make it more likable, but it didn't. Not the gun's fault, just not a good match between gun & owner.
So because he didn't like it there it sat unused in a safe or drawer, with some sour grapes tossed in for good measure. That would explain why he fairly leaped to trade off with you, to get what? The 1911 he actually wanted in the first place!
I've seen several Taurus I liked but personally I'm more inclined to trust my life to CZ, no offense to anyone. His loss is your super-duper gain, you definitely traded up.
Happy shooting, pardner...