The first time he asked if she could stay over, they had already been together a few months. It was a lovely relationship and lasted almost a year. My son had his first serious girlfriend at age 16 and she was a year older than him. But I’m happy with my decision and I’m happy to share how I came to making it. This question is perplexing many of my friends at the moment, the ones with teens around 15, 16, 17.Īs with most parenting dilemmas, I had to figure this one out on my own a few years earlier than my friends because their kids are mostly younger than my eldest. When do you know when your kid is old enough to have sex and wants to have someone sleep over at your house?