My wife and I are both in our 50's. When we were dating I discovered that she used to rent porn movies and watch them to get excited and then masturbate herself with a dildo. I have been masturbating ever since I was about 13. She used to get really wet when I rubbed her pussy and made her come. However now her pussy is dry. But thanks to mutual masturbation we are still very much into sex. I rub her pussy every night. She like me to use her belly to make my penis explode. She also likes to see me jerk off.
It is good to read about other long term couples that also like to masturbate together.