That's good of your dad.
A lot of people don't have such supportive parents.
My mother bought me a house when I was 18 (well she paid for about 90% of it anyway) - this was JUST before the house prices went too sky high, so it wasn't a ridiculously expensive house or anything. It was extremely nice of her - I would never have managed to get on the property ladder without her help.
I agree that it's pretty strange to be living at home past mid-twenties, but sometimes situations force people to do it.
Until he moved in with me at the age of 26, my hubby lived at home with his mother.
He had moved out a few times but he lost his job and couldn't afford to pay the rent, so ended up back at his mam's house.
I do agree though that 44 is waaaay too long to be living with parents.
(Unless they are really old parents that need looking after of course, in which case it's fully understandable).