I find this concept of having children so "other peoples children don't have to look after you" the kind of thing utterly stupid people say
So what when you are older you don't want your children to take you to the dentist, or the optician, or the hairdresser or the GP? Or do those people not count as someone else's children that you are paying to provide a level of care?
Besides which, if Elon Musk did a show of hands of every billionaires children who intended on not sourcing care for their ageing parents he would not find many, if any hands. I very much doubt his children will be caring for him in his old age
Instead he has all the morality of a man who hoards wealth whilst other people's children starve