I suspect it is all Mr Terry Wogan's fault. He describes an action similar to that of going upstairs and forgetting why you went as a "senior moment" because it affects those of a more mature age range. Morty refers to it as CRS (can't remember shit) which is funnier but not really the sort of name you want to use for a product....

I don't know where he got the phrase from, but he certainly made it popular....

LTS