Like obviously I think if a new born baby died it might be less sad than toddler, because they had less connection to the world and less of a bond.

Meanwhile a toddler is really cute and more innocent, compared to a teenager that might be starting to experiment with drugs, steal your money, etc. So maybe it's less sad for a teenager to die, which is maybe why so many commit at that age because they can sense the parental love fading?

So I guess the really question here is what age do parents love their kids at the most? There must be an average peak of love correlated to the child's age that parents have for children, then after that point it's all downhill.