How best to open a blueberry?

"autism didn't exist back in my day"
autism back in the day:

Same shit why ADHD wasn't as prevalent back then because everyone smokes and nicotine is a good stimulant for ADHD.
- that makes me wanna try it but I CANNOT be trusted with addictive chemicals at this point in my life 😭
I'd wager that some examples of autism back in the day resulted in things like obsessing over the math about change resulting in calculus, or about what happens to things moving at close to the speed of light, resulting in special relativity (and that obsession continued until it was generalized). Or a guy that loved to paint but also invent things that couldn't be made with the tech at the time. Or realize that everything in the solar system is moving the same way and there is no special retrograde movement, it just looks like that because we're moving at a different rate.

I'd wager there's at least a bit of autism involved in most cases where someone realized that conventional wisdom was wrong, with possible exceptions for times when something new gave access to new obvious evidence, like the microscope letting microbes be seen directly.

Was not aware we were supposed to compare shoe size to age.

Just make sure you use metric units or the whole system falls apart
- The whole system is, in fact, falling apart
  
  edit: this is about the US, right?
- Maybe that’s the root cause of our current situation: we are all 11 years old
I think he's playing on the saying "act your age, not your shoe size," hinting that he knows it's a silly/childish thing to do, but excusing it because his feet are enormous.
For a better ageing experience, you should start to regularly work out before you get older than your shoe size.