competition is more fierce today regardless. even in high school kids today are way stronger, faster, and bigger than 30 years ago. to even play a sport in high school these days in a school there is a lot of competition.
the guy at the NFL combine just a few days ago DESTROYED the 40 time record like it was nothing. if you have more people in this world, more advanced training techniques, and more of a discipline teaching sports from a young age.. that is what you will end up with. MORE talented athletes. in the 80's nobody ran a 40 time in under 4.4. now if a guy runs ONLY 4.6 which is still fast a fuck he drops 2-3 rounds in the draft cause nobody wants him.