It is true that people are getting bigger, and I don't mean just fatter!
I was saying to someone the other day that "I used to be tall" (6' 1"at 15 or 16 years of age) . I was the tallest person in the school. These days there could easily be 3 or 4 boys taller than that per class, and probably quite a few who are 6' 4"+ in the school!
I was on one forum ride and there were 3 men at least 4" taller than me out of about 20 riders.
My ex-partner was unusually tall for a woman - around 5' 10" - but I see many more young women of that kind of height now. There was a 6' tall woman ahead of me in the queue at Aldi the other night.