Parents, do you ever feel that having kids was not your best decision and that they are a burden after a certain age?

Nope, on the contrary, I regret not having them earlier. First, having a baby anchored my life. I considered myself a nutcase and confused about life and work. Now there is a certain clarity, and it is easier to make decisions -- they only need to be favorable for the kid. Second, I guess our bodies get tired after an age. Having kids while you're still young and got the stamina is surely preferable.