Although he has lots more money than I, adopting or having a child later in life may have these problems: lack of siblings, mortality of parents at the child's young age, less patience by the parents, older philosophy of child raising, more possibility of genetic problems for the child, childs vs parents financial requirements.
Plus sides may be: more patience by the parents, usually a deliberate choice so the child is more treasured, parents are retired so they can spend more time with the child.
Given a possibility in going back in time with other things falling into place, the Princess Royal would have been born to us when we were younger. But, you play the hand that life gives you and hope for the best.