How much does he weigh? I'd get a weight on him and watch it closely. I had one fast for almost eight months and didn't lose hardly any weight, she was at about 2500 grams. I'd only worry if your snake is real skinny, you may want to post a photo of him. At that age he should be filled out nicely and you shouldn't have to worry, they can fast for up to a year and lose hardly any weight. I have a couple 8 year olds and they are about 3000 - 4000 grams, plenty of weight to fast for a very long time.
I have a snake that decided to stop eating for a long time, she decided that she only wants fresh killed adult mice! (I use CO2 to gas them). You may give that a try, especially if it's a really filled out thick snake. My fresh killed mouse eater won't eat a live rat, frozen thawed rat, or fresh killed rat, only a fresh killed mouse! You can also try a smaller live rat, I find that the reason most snakes don't eat live is because the rat is too big, you may try something in the 70-100 gram range. I prefer not to leave a live rat in the tub for more than five minutes and if not eaten I move it to the next tub. For me it works best to feed later in the evening and feed so the snake can't see you, just pop it in and walk away and come back in five minutes.
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