I’m not sure if you are asking as a senior or not, since you didn’t specify age. Actually, I think studies have found that 50% of married couples in their seventies has sex about twice a week on average. Single sixty/seventy year olds, I don’t know. Perhaps they are scared with all the STDs going around, or it could be not wanting to get close to someone again (say, if they had been married before). I’m not so sure it’s drive that is lacking, it’s probably something more complex.