In the two examples you gave, one could safely infer that you are at least 27 and 38 respectively, assuming you listed a degree. If a company wants only to hire

In the two examples you gave, one could safely infer that you are at least 27 and 38 respectively, assuming you listed a degree. If a company wants only to hire young engineers, this is a way to discriminate. But I assume the 55 year old would probably include some prior experience on a résumé or application as well.