It's not an age thing, it's a personality type. Some people are just wired differently and any real sexual desire is overridden by their obsession with power, success, control, etc. Sometimes sex is tied into that sometimes it isn't. I worked for a CEO one time who had no interest in women beyond wanting to be seen with them. All the other execs fucked around on their wives, went to strip clubs, talked about women like they were objects... This guy never cared about any of that. He didn't even live with his girlfriend of like 6 years. Bizarre.