Anyone else thinks that Whiteboard interview is just covered ageism?

It's the second time in a few months I'm being turned down with the pretext of a failed whiteboard interview. Things like improper syntax and not getting the damned recursive solution fast enough. Given that I am 42 yrs old and been at this line of work for 14 yrs now I think it's safe to assume that I neither have the time nor the appetite to constantly exercise on solving mind puzzles in whiteboard. I am good at what I do -and I do it at a top level company- but it has nothing to do with coding on a whiteboard. I'm sure that anyone who is a few years _out_ of the university and _into_ a real job finds it both hard and surreal to go through these hoops to land a job. Whiteboarding simply tests for skills that are not needed nor exercised once you're out of uni . Thinking all that it then dawned on me. Maybe this abomination is just a way to take out older candidates and favor young ones. A form of ageism that is legally safe for the company. Dunno - what'