I do not believe it is age that necessarily changes what we dream about or even how frequently we dream as there are a lot of factors that influence what we dream about. I am 45 years old and I still from time to time dream about some of the strangest things including things like dinosaurs, dragons, and other strange looking animals.
https://www.livescience.com/health/dreams/do-your-dreams-change-as-you-age?utm_medium=referral&utm_source=pushly&utm_campaign=Clicked%20Last%2090