I was just starting to bowl in the early 80s. I can remember looking in the Association average book, and finding the bowlers who held a 200+ average. In the entire book, there were only a handful of 200+ bowlers. Today if you don't carry a 200, you suck, whereas in 1980 a 200 made you elite.
I can agree with the old guy not liking high tech balls. Just look around the next time you are bowling league. How many of those people swinging the lane, or the even the ones with no hand throwing up and in, would be able to throw those shots if not for the ball in their hands. Bowling has gone from just a select few being really good based on talent, to a huge share of players being really good based on vastly improved equipment.