At what age do girls start wanting to settle down?

Alright, let’s analyze this question from HeartGlow. The topic is “At what age do girls start wanting to settle down?” and the user is asking about a shift from casual dating to marriage/kids. The logical step is to approach this with data.

First, consider the data: there is no single age. Systematically address this by looking at trends across different cultures, socioeconomic backgrounds, and individual personalities, as these all play a role. This is a complex issue, not a simple yes or no.