I'm not the person you replied to, but I'm now in my mid-30s and I too have written off having children for a number of reasons:
* Having and raising children is expensive (both financially and otherwise) regardless any factor(s). Any parent will corroborate this.
* I do not find life worth foisting upon a new individual; life is nothing but challenges and hardships. I refuse to throw a newborn life into this hellscape.
* Related to the above, I refuse to make my children be witnesses to my inevitable death. I am in that phase of life where I must deal with the eventual passing of my parents, and that is fucking hell. I do not wish this experience upon anyone, and to that end I refuse to have children because to do so means I wish this hellish experience upon them.
* Children as a concept is hypocritical: On the one hand I am responsible for their well-being and that implies I can and will and should have a say in their life; on the other hand they are independent individuals whom I cannot violate, and I refuse to impose my will upon them anyway because that is not my place.
* I find the entire notion of a family far too bothersome for my life. I do not need nor want a spouse whom I won't ever understand anyway and whom I will grow to resent. I do not need nor want children whom I won't ever understand anyway and whom will grow to resent me. I do not need nor want familial relations which will all be concentrated bullshit. I do not need nor want any of that noise in my life, I desire peace and tranquility.