What is the real point on having kids?

I am 35 year old happily married and unable to have children. Most of my life I felt great without having children, I still do, however sometimes I feel life with them can be funny too. However when I get into the real question of why do people have kids I dont find anything convincing. I wonder if people just reproduce because they feel that's their duty/goal in life or because they dont want to be lonely when they get older, or because they just couldnt help it. I would appreciate your respectful opinions to see if there is any motivating part of having children at all.
What is the real point on having kids?
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