Milo Ventimiglia is apparently "devestated" over the fact that Hayden Panettiere chose to ask a friend to be her roommate, rather than ask him to move in.
"Milo was secretly hoping Hayden would ask him to move in to the new
pad. He is keen to take their relationship to the next level by moving
in together but Hayden is not ready for that. She has told him she still wants some of her independence because she is young.
She wants to stay young and is not ready to settle down yet, so
moving in with a friend was the perfect answer for her. Milo was
devastated but he has promised to wait."
I mean, if he really needs a place to live, I have a very cozy spare room in my house…
No, but in all serious, this is where the age difference comes into play. Age is only a number, until the man in his 30’s wants to go the next level but the 20 year old woman still has more experiences left to live before she settles down.