I wonder if you can use "cromulent" to guess the age of a person. Older people would not have watched the Simpsons in the early 90s. Younger people very likely missed this obscure episode. I would guess an age of the user to be 30-35.
I may be an outlier but as a seventeen year old, I'd already heard of 'cromulent' (from the Simpsons, but through Reddit).
The episode was first aired in Feb ‘96, at which point I was 20, and in college. At this point the show was still quite popular with my friend group. I am currently 42. You might need to increase your upper bound on the age range.
You're not far out, but I must have missed that episode originally and only watched it in the last few years. I possibly also learnt it from Reddit first.
My editor, in his mid 60s, uses cromulent quite regularly.