Many mature couples have reported that they have a more rewarding love life than they had in their younger days. The reasons for this include a new intimacy between partners, more time to spend together, no worries about pregnancies, and fewer distractions in the home. However as you reach the age of 50 or so, some issues may arise which could put a temporary damper on your sex life.
Unless there is an underlying medical condition, this issues are usually easily resolved.