caffeine?

My husband is really addicted to coffee, every time I bring up that caffeine (drinking almost 10 cups a day) has side effects on Fertility is bad that we should BOTH cut back. 
(I only sip on his, so In a day I have maybe two cups) anyway, I tell him Two cups shouldn't be that bad, but 10 cups is not good, and it always starts a fight. I don't think he is taking this serious at all. He is 42 years old anyway, and I've been trying to get healthier and help him with everything but at this rate. I just want to give up. We've gotten pregnant twice 2015 that ended in Miscarriage and then 2016 still born son. We've never had a check up on  any issues (although I plan on getting one soon) and every time I bring up that his fit is "Great! I have to take off work and waste more money on a doctor visit! We know I can get you pregnant, so I have good sperm." 
Uh.... we've had a miscarriage and still born son over T13! Chromosomal issues! So it could be either one of us, but still. I would like to know before going back through that same crap! 
Does anyone else have a husband like this? Who you are trying to help and all the weight of TTC falls on you? 
Btw I'm 20 years old, and like I've said... he is 42 years old. We are married, and no, I don't need all the lectures on the age gape. 
How did you help ease your husband into getting healthier and off the habits?