Research from YouGov shows that younger Americans are more likely to identify themselves as introverts, and less likely to think of themselves as extroverts. Only over-65s are more likely to describe themselves as extroverts (43%) than introverts (30%). Most under-45s, on the other hand, describe themselves as introverts.

Curiously, even though 44% of Americans describe themselves as introverts, only 20% say that they dislike it when strangers start conversations with them. 68% of Americans say that they like it when strangers talk to them. The generational divide on this question is very clear, though. Under-30s are more than five times as likely as over-65s to dislike talking to strangers (33% to 6%), and only a bare majority of under-30s (52%) like it when a stranger strikes up conversation with them.