less bold? what do you mean?

less willing to take risks and be independent. less active and staying at home for more time. but thats almost all down to controlling parents who teach their kids to be scared of everything and dont let them go out alone, and the news channels feeding that fear.

some of it might also be social media (fear of public embarrassment) but one thing its definitely not is any kind of large scale hormonal change. culture beats biology almost every time when it comes to social behavior and there is no evidence that its different in this case.