[cruise02]

Use some common sense. For how many values of $x that would be the subject of an interview question are 5 year olds going to be better than grandmothers?

[CaptSpify]

Your missing the point though: There's a reason the "non-technical grandmother" is a stereotype. By using "common sense", it makes sense to use that stereotype.

[cruise02]

Please do advertise that since there's a reason for stereotypes, your company uses them in making hiring decisions. Let me know how that goes over.