The request for your degree date is perfectly proper and not unlawful to require. The currency of your education has nothing to do with your age.
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Unfortunately many industries believe that less-current education has less value. An engineer with a degree 5 years out of date is unfortunately believed to be less "on top of" the current industry cutting edge unless they have been working in the interim.
That is probably why your employer is demanding a graduation date, I do not see a viable claim here.
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