Until what age do a man's testes continue to make sperm?

After the age of 45, semen volume gradually decreases due to functional decline of accessory glands

I believe this is the answer I might be wrong but I am super sure that this is the right answer. (Answer got from a text book/don’t copy words that would be plagiarism)

If helped mark me the brainiest!!

Your answer is  d.)relationship between pressure and air volume and led to the understanding of how respiration works

The answer is b. increased blood flow reduces nerve sensitivity