imdb.com doesn't list Ray Martino's age, but he played the "law students" father so he must be at least in his late 40's/early 50's. FWIW. Sounds more like a babysitter than a roomie for Daniel.
Sometimes, there are just plain good people in the world. Martino is older. Maybe, finally, someone was just treating Daniel like a son and he was someone that Daniel trusted.
Harding, the PI, said in an interview that Daniel regarded Martino as a 'father figure'.