BoJon

I have a 16-17 yr old corn snake, this is not first time he has gone a couple of months not eating but this time he is extremely active in day time. He normally eats live or frozen white adult mice, he won’t eat coloured mice. His eyes are clear no mites does not appear to need to shed. In last month along with frozen I have tried 3 live which he kills but doesn’t eat.
I’m thinking breeding issue? What do you think.