I have a 12 or 13 year old male who is a devout mouser. He's still a sizeable snake for a male (1700 grams, give or take), but he has always gone on an annual 5-6 month fast over the winter, so when he is eating I offer him an XL mouse once a week. My female is about 6 or 7, larger than the male, and throughout the winter she usually eats a small rat about once a month, and in the spring/summer/fall months a small rat once a week. I generally prefer to feed small prey items weekly, but sometimes I will double up (two prey items each) and let them digest for two weeks.