Mastodawn

"We never saw any of this ADHD or autism stuff when I was young!"

You never saw any photos of the surface of Mars back then either, but I'm pretty sure it was still there the whole time

Much of this is due to better diagnostic tests and increased awareness, aka, we're smarter now.

Some is also due to conformity pressures created by our culture.

At least in the early 90's, there was also a problem with overdiagnosing kids w/ ADHD.