Racism and sexism do abide also, they are outlawed in general, and criticised in no uncertain terms when encountered. Ageism is hardly ever criticised. I've ranted on ageism more than once on this blog, relevant posts can be read by clicking on "ageism" in the Label Cloud in the sidebar.
I was pleased, this week, to come across a piece by another blogger regarding this bête noire of mine, in particular relation to content aired on Saturday Night Live recently:
Saturday Night Live Elder Bashing
We no longer watch SNL - it stopped being funny, for us, years ago. I can't say that I'm surprised about the criticisms made in the linked piece.