WMEX, and very few other “Oldies” stations, actually use the word “Oldies” as a positioner anymore. You don’t hear it said on WMEX, though it’s an “oldies” format.
I think that, in general, the industry today feels that the word “Oldies” makes the audience “feel old”, and may connote that only “old people” listen. “Oldies” stations today usually identify as “the greatest hits of all time” and similar slogans, without using the word “oldies” any more.
There are still syndicated "True Oldies" and "Real Oldies" formats, though, that identify themselves as such in DJ talk and liners, and stations that carry them aren't bleeping out the offending word.