I'm 38 and have been programming since I was 8. 30 years. In those 30 years, outside of prescribed variable names in high school AP Comp Sci exercises I don't believe I have ever once used foo, bar, baz, or any other metasyntactic variables in any of my programs or documentation. I tend to be more descriptive than that. I'll at least go with do_the_thing(input1,input2). None of this f(foo,bar) nonsense.
"I appreciate SDF but it's a general-purpose server and the name doesn't make it obvious that it's about art." - Eugen Rochko