I cannot stand aging.
The moment you turn 30 life is effectively over. There are no more opportunities for the most life affirming substance on earth - cute young girls. Outside of prostitution, you can no longer have sex with pretty young girls that give you butterflies just looking at them. And prostitution/sugar daddy relationships cut out all the stuff that amplify the experience tremendous. The slow build of figuring out if they like you, the tension and electricity that comes from mutual attraction, the ego boost you feel from all of it.
The moment you turn 30 you are no longer cool. You are not admirable to anyone young. You become antiquated to the modern culture. There are no more aventures. There is no more youthful freedom. There is no more aesthetic romanization of your life - you are ugly and degrading and worthless. Old people are a staircase for the young. You serve as a cog in creating the world that allows the young to experience pleasure.
70% of your life is spent as an old person. You live to see yourself degrade every single day. It is utterly devastating. There is no cope.