That is different for everyone. Some won't be mentally ready before they turn 30!

Where I live, denmark, the age where you can have sex with an older person is 15. And truly alot of 15 years old don't even have a brain yet! Lol others are mature enough.

So you can't really put sex into number can you?

I'd say youre ready when you feel you are ready and when you can handle the consequenses of becoming pregnant by accident.
This means - comdom broke? Well tough luck, deal with it. You were old enough to have sex, youre old enough to give birth to the child and give it to someone more responsible if you can't financially and emotionally take care of it yourself.

Just my point of view. :)

In my opinion I don't understand how you can be mature enough to have a child before you are mature enough to drive or drink. I don't think there should be a number on the legal age to have sex because it is different for everyone and by having an age limit on it it causes more teenagers to lose there virginity due to peer pressure.
I was 13 when I first had sex and I am disgusted for that. I definitely wasn't ready but by having an age limit it can cause for teenagers to break the law and rebeling. You need to be 100% ready and only you knows when you are ready