I have not been interested in a partner for YEARS. I can honestly say I have never been happier in that department.
I like being alone, having lots of friends around when I want them around and just having companions here and there that I want to spend time with. Sex is pretty much defunct. I am simply not interested in physical affection. I am a massage therapist. I touch people plenty, I don't need to be sexual any more. Could care less.
It is very very freeing not to depend on others to love me. I don't understand people who are 60 and 70 and 80 year old horn dogs. It's ridiculous, and for people who don't have anything better to fill their lives with. Those days are for the young who need to procreate. I don't need. Period.
I disagree with you on the sex part (Yes, I dare disagree with you, don't have a cow.) You are projecting your beliefs on others of our generation. I envy those who are able, willing and still like it. It is easy, fun and can instill an higher form of intimacy. Read the studies...all of which I have read are quite positive.