I sort of agree with this. I had not run for 6 months when I was about 35. I went to the track hungover and ran 60 point, then rested ten minutes and ran 60 point again. I was sort of impressed with myself but my high school PR's were 48 and 1:52. I was more impressed with my buddy, a tall and big dude and never a competitive runner, who managed a 69. So anyone vaguely athletic should be able to break 70 within this age range.
Yeah my older brother's 33 y/o and 6'1" 210lbs and I trust him to break 70s with a bit of pacing. He was a decent rower way back in college, but he's got literally zero real running experience. I might invite him to try it next time he's in town. I'd also estimate maybe like a 6:45-7 flat mile for him.
IF you are 33 and 6’1 210, and you have “zero real running experience,” and you can run 6:45 for a mile, you are a major running talent.
Athletes should also need some basic agility too, not just be able to lift some weights and run a certain time. For example, an athlete should be able to, if not do a dash vault right away, be athletic enough to be able to pick it up with a little practice: