Age difference and conceiving

Hi all. I'm 21, 22 in May and my SO is 35, 36 in March. We're engaged and our wedding is on the 1st of April, we've recently started trying for a baby. We both have high sex drives so have sex nearly every night, I think the longest we've gone without sex is two nights. We're still not pregnant and he's starting to worry that his age is lowering his sperm count. I was on the implant before trying for a baby and apparently I'm all fine down there and very fertile. Do any of you have any experience with struggles in falling pregnant with a larger age gap? Thank you!