Not Likely A Health Problem, But A Matter Of Curiosity.

Not likely a health problem, but a matter of curiosity. I am an 80 year old diabetic man. I have noticed that my testicles, whih used to raise and lower with temperature and activity changes, no longer seem to be reactive to thermal change. They are not elevated, but about in the middle of their former range. They just never lower or elevate from that point. I'm thinking possible neurpathic changes, but there is no discomfort. Is this a normal aging change? I find nothing in the literature.