Age is a category that employers have to be very careful about, because age discrimination can open them up to lawsuits. For that reason, you should leave your age off of your résumé. However, there are some other things to be careful of related to your age.
If you're an older worker, you can leave specific dates off of your educational history. It's sufficient to say that you have a degree in economics. Pointing out that you received it in 1978 can give the impression that your education is dated and irrelevant. Of course, they're going to find out how old you are at the interview, but at that point you'll have the chance to wow them with your up-to-date skills and emphasize the value of your experience.