I waited until I was 23 or 24. Don't remember exactly. I am so glad that I waited until I was an adult. I am trying to instill the same thoughts into my 16 year old son. If you start too early and get someone preggo, it can change the outlook of your whole life. My parents never gave me a talk about the birds and bees, but it's more like I did what was expected of me and did not want to disappoint them. They stressed getting your education lined up before anything else.
Of course, in rural America, things are a little different. There is not so much excitement/entertainment being away from population bases, so they have their own set of challenges.

I think they do wait longer...but again, education and finishing school is a priority...I also think they have more realistic education on what it is like to be a parent...night feedings, changing diapers, etc.

When you keep people in the dark, it raises more curiosity...and also keeps children from telling adults about sexual abuse...the taboo and shaming in our country is really terrible.

I waited officially until I was 17...unofficially, I was 10.

The Dutch have a much healthier attitude towards sex and sex education. Less religious hypocrisy around the fact that sex is a natural human activity.

This is for religilous conservatives in America

The Netherlands has one of the lowest teen pregnancy rates of the world. Sex-education starts quite early and the topic is not such a big taboo, especially not in Amsterdam where condoms are displayed in the window of world's first condom shop.