Parents might age faster or slower based on how many kids they have

[poo emoji here]

Please don't make baseless accusations. If you had actually read the article, you would know that the scientific study described reports a "U-shaped curve" of negative health outcomes as a function of number of children, specifically highlighting the "finding that people who didn’t have children also aged faster and had shorter lifespans."

I suspect that your default assumption may be revealing an internal conflict that, in my experience, many parents seem to navigate at one point or another. Disregarding that and taking the statement at face value, I'm glad that having children is "the best thing in the world" for you and I hope that continues to be true. That said, I'd emphasize that your opinion is unlikely to be shared by everyone on the planet, and the implicit dismissal of other viewpoints as "nonsense" (including the evidence of the peer-reviewed journal paper described in TFA that would probably _bolster_ your assertion) is probably not the best strategy to convince the undecided.