Youth and hormones--they usually begin to mature around forty. Change is necessary for growth and they must change, adapt, and forge their own future. They live in an environment that has become threatening and much more dangerous to both adults and children.
My daughter and I had a relationship that blossomed in her teens. I would plan overnight shopping trips and we would watch videos in the hotel room. Go to beautiful parks and cities . MEMORY MAKING! I have to say it was the best money spent on a not so large budget. It has been six years now and we still talk about the memories we are BOTH so fond and loving of.