So happy to know that you are still sexually involved with your wife and enjoying to workout the age related changes for quality of sex life. Yes sex is different at various stages of life and we need to be prepared for and work around the physical changes and enjoy life. Both of you are nice example and learning for various couples in young and middle ages. By and large people fail to realize the erection and penetration is not the only sex. Now continue to enjoy what you are doing and just take care of cleanliness of body and sexual areas in particular, keep them fresh and fragrant. All the best.