Tech recruiter here in Switzerland; sadly, I can only agree. Ageism is a big problem no one talks about.
DEI (Diversity Equity Inclusion) extends primarily to (minority) ethnicities, women and nonbinary, religions, and sexual orientations. Age is definitely not a DEI KPI target.
At what age does ageism kick in?
It depends on the gray hair count and chin sagging. Fixable with dye, plastic surgery, and other forms of creative, strategic deception. :)