Can tonsils change shape throughout life? i never really looked at them before but they are different shapes but pretty equal in size.

Usually smaller: In general, but not always, the palatine tonsils, (tonsils in the back of the throat) get smaller with age. However there are many adults with a sleep disorder who have very large tonsils. But as a rule, they tend to atrophy with age. Certainly, we also know that their protective (immunological) function diminishes with age also.