When sex becomes difficult, touching and caressing become important and powerful means of expression. Everyone needs and craves physical attention, no matter their age. Although some people in this generation have overcome horrible beginnings, such as marriages started with little or no sexual experience and limited opportunity for frank discussion of sexual matters, most probably aren't taking on new behaviors. People probably aren't going to start having oral sex, for example, at age 60 if they haven't been having it all along. Couples naturally express intimacy in different ways as they get older.
Companionship becomes more important than sex.
There's a change of focus. I teach my students, people in their twenties, that sex is not just about orgasm. And this is a lesson they can learn from their elders. Older couples emphasize intimacy over physical prowess. While younger people tend to equate intimacy with intercourse, older and more mature couples do not.