Why do people feel they have to settle down before 30?

Sun_Kim-Ai
Why do people feel they have to settle down before 30?
This is the thing I don't understand the most. I had a discussion about this with a friend who's 36, and she made a joke that "it's too late to settle down" for her.
I got a bit taken aback by this, and stated that more likely she does not want to, more than not being able to, and that you never know when the right person can come along.
She said that I can say what I want, but she doesn't give weight to my words since I married someone under 30 and not someone her age. Even if my wife is older than me of four years, my friend thinks I'm an hypocrite because she's still under 30. She implied I considered her "good enough" only as a friend or something else because of her age, which upset me.
What are your thoughts?
Why do people feel they have to settle down before 30?
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