I once dated a guy who was skinnier than me, he was 18 and weighed I think not even 100. He was very very poor and when I tried to give him food he would only accept it if it was fast food, despite him being starving. I only weigh about 105, so if a guy weighs less than me, YES I feel bad for him because I am concerned about his lifespan!! ! It makes me very nervous about his health.