It is hard for older children to get adopted, because they have a better memory then little children, and can remeber there last parents. Also older kids thing that since they got adopted they can act a fool whenever they feel like it without a punishment.
Answer: Not sure but my guess is that its because the people who are adopting kids think older kids are bratty or spoiled, even tho it's not really true
I think change can make someone nervous but I learned that change is not so bad becasue everyone is kind with open arms and change can also be a good thing from the get-go