I've been married 20 years and we are together longer than that... Two kids that are now grown.
Yeah, kids and jobs and life sometimes gets in the way and sex life can wax and wain. We had a very dry spell recently because I had some health issues and was dealing with empty nest and change in career.
Let me just suggest something that is a little different than maybe other advice you'll get here.
VITAMINS. Oh my god they have made so much a difference in my sex drive. Women specifically can be deficient in several vitamins that drastically effect libido. I never new this. I started taking a high quality liquid multivitamin because I recently had gallbladder surgery and read malnutrition can be common afterwards. The difference in my level of horniness has been monumental. Huge. Like I'm 25 again... And it wasn't even the goal. It wasn't even in my radar screen as a reason to take it.
Mostly OH and I have had an amazing sex life and mostly dry spells over the years came from my end... I know it's a variety of reasons... But I will never laugh at the idea of vitamins and supplements again! I think again and stress effect men and women differently, talking is key and friendship most important. But there's no downside to trying a good quality vitamin and you never know :) ...
A year ago I would have laughed at this idea. Now? We just had a vacation weekend and sex 12 times in 3 days... Not bad for two people about to be first time grandparents! (Mid 40s and early 50s)