If it were the other way around, I guarantee someone would be on this thread arguing that obviously this means that older people don't have enough mental stamin

If it were the other way around, I guarantee someone would be on this thread arguing that obviously this means that older people don't have enough mental stamina and energy for fast-moving companies and startups. After all, if two people walked a mile, and one of them was more tired at the end of it, that person's probably less physically fit -- why wouldn't mental jobs be the same? A lot of biases work this way. People look at a result and then come up with a plausible explanation that just happens to already fit their worldview. It's a very subtle trap that's very, very easy for people to fall into -- I have my own fair share of embarrassing moments where I've done this. I think it's important to be very careful when interpreting results that can have multiple different causes, particularly when they're not linked to a previous prediction.