Men age and fertility

I read today that a mans sperm count gose down with age and it takes a 45 year old man five times as long to get his wife pregnant even if he has a Young wife of 25 it take 4 times as long. My husband and I have been trying for a year this month and he is 40 and I am 26 I never know his age could be a factor in how long it will take to conceive so I thought I would share it.