I think that is the only way it would happen, I have let mine accumulate, and they are all still here, some I have deleted, but otherwise they do not go away on their own to my knowledge.
I really should clean all mine out too, I just have this problem with change
I'll get to it, is my usual response to things these days, ha!ha!

** hugs **
DE

In giving advice seek to help, not please your friend
SOLON