They no longer have to lock their bedroom door. They can make love in the living room with a fire in the fireplace, candlelight, soft music, and a mattress on the floor, if they wish. They can awaken in the morning, when both are closest to the sensuous world of sexual awareness, and take as much time as they want to make love. No need to beat the rush hour to work or worry about what must be done during the day before they can afford to relax in each other's arms. Of course, I am assuming that both are committed to a healthy lifestyle.
Cleanliness is more important than ever.
If and when older people do complain about their partner to a marriage counselor, the complaint often takes the form of distress about the partner's increasing neglect of bathing, or not changing underwear often enough, or, worse, leaving dirty underpants on the floor for the spouse to pick up. Sloppy personal habits are a turn-off at any age, but when we grow older, we tend to get lazy and forget that someone so close and dear to us can interpret lack of personal care as lack of love. Don't let laziness rob you of sex.