Yes, I know that he seems small and skinny. The woman I got the snake from assures me that he is that old- she has had him for at least 3-4 years. I have not actually whipped out a measuring tape or string yet, so I am not 100% sure. They were only feeding him about one jumbo mouse a week. I plan to up that to two mice a week, seeing as he seemed hungry still after his last feeding.

They were feeding once a week? You think with his age I should continue that or up the amount of mice, but only feed every 14 days?

I plan on completely redoing the tank and thank you a lot for all your advice. I figured the enclosure for him is familiar so I would keep him in it until I get the nicer set-up made.