We have been very active hiring developers. I, as manager have to select from the candidates CVs and do follow up interviews.
I never ask age or care about it.
Recently saw a post on Twitter looking for a developer with 1 year experience, and specified age range.
Not sure if this common practice in other countries (I work in Mexico). But I find it that it only reduce options (setting aside that is just descriminatory).
Not sure if there is an actual value on setting an age limit when looking for dev candidates, that I am missing.