Well, if you are one of those people you could help enlighten me right now, but you seem reluctant...

I am not saying that it's impossible to avoid being incredibly lonely without kids, or even that loneliness can definitely be avoided by having them. I'm not saying it's impossible to have a fulfilling life without kids. What I am saying is that everyone is going to die. And without kids all the people close to a person's age will die & become incapable of traveling & interacting in a similar time frame. Kids (if you raise & treat them right) are likely to produce a growing network of loving relationships with younger generations of people who wouldn't exist without you & as a result have some natural inclination toward loving & appreciating you, & seeing that you are cared for in your old age. What happens later in life is certainly not the only thing to consider, but it's an important piece IMO. I think the more someone tries to buck our biological programming, the harder it will be to achieve real feelings of fulfillment.

And I think there is a very anti-human cult of people trying to encourage others not to have kids & to misattribute natural feelings of awkwardness to being in the wrong body & other such nonsense.