What is The Right Age To Settle Down?

When I tell people I am ready to settle down. They ask me how old I am, and they laugh and tell me that I am still a baby that I haven't went through any thing. But what do people mean by I haven't went through anything. I'm twenty years old and I feel like I've been through a lot these past couple of years. I've done the dating, I've done the 6 month inch, the year and two year relationship. Why do I feel like settling down? I guess I feel I don't want to have kids in my thirties I don't even want to get married in my thirties. I feel that is too old for me to have kids and raise them till I'm fifty. Older man and woman tell me I have a lot of growing up to do. I don't see it that way. In today's society men and woman my age are having babies in their early teens. Getting married when they turn eighteen. Having different baby daddies and baby mommas. It's ridiculous that is not going to be me. But it's hard nowadays to actually find someone who is around my age and mature enough to want to be in a committed relationship. Some of these young men are very disrespectful and unfortunately not well educated enough to even pick up a book and read. They are caught up in what's hot, how many woman they can sleep with, and how much money they make. I am not downing any of my peers because right now money is what makes the world go round. But I will say it's hard to actually find someone who is real. There are a lot of perpetrators and pretenders out here. I guess I am getting ahead of myself. Wanting to figure out how this came about. I wonder still... What is the right age to settle down?