personally, i dont want kids right now, but maybe one day i will and i would probably adopt just because i dont personally have the need to have a child that is biologically my offspring, but i can see why others might. it's sort of the same reason babies are more likely to be adopting than a 10 year old.
But I can see why a baby would be preferable to an adoptee as they could raise them with their own values and morals. A 10 year old already will have a lot of his/her opinion on the world formed, plus adopting a 10 year old means you've missed out on bonding over some of the most important years in your child's life. It's a tough ask of anyone.