20Oldest Child: Matures Earlier Than You Might Expect
Unless there’s a huge gap between the oldest and the next child, when leaving them as an only child for a significant period of time, there’s a huge chance that they’ll mature quicker than you might expect them to. As your attention becomes divided, they might start to have to
deal with certain things on their own; and even if not, they might want to share some of the work by taking care of their younger sibling. Either of those things could teach a kid to mature faster.