"Co si myslíš o starých mužích s mnohem mladšími přítelkyněmi?"

Translation: What do you think about old men with much younger girlfriends?

[EinatAdar]

Would it be possible to accept older men instead of old men? It's the more polite form (:

[BoneheadBass]

In English, "older men" may be used more often, but the adjective in this sentence is "old" rather than "older." That may be why "older"is not accepted.

[EinatAdar]

Yes, that is probably the reason, and that is why I phrased it as a question. On second thought it may be better this way, just to make sure the two adjectives are not being confused.