Hello everyone! I am new to this site! Hope I am posting in the right area.

I just bought an adult BP from someone off of facebook. He said he has had him for 20 years. I know according to stats the snake may only live awhile - that's not the question

He told me he only fed it 2 mice once a month, and only live mice (he said if I thunk the mice it won't eat them). I want to feed it more often and feed it f/t. If it is that old, can I teach it to eat something different? And will it hurt it to start eating more often. Poor thing.