Age is just a number. The conservative society dictates who you'll date or if it Shames you for dating many years younger than you then that society is doomed to fail.
One example is how society generally accepts when a middle aged woman dates a young guy but when an older guy dates a young girl who is above 18, it's often seen as a inappropriate. Its because woman are still seen as not strong enough in society to be independent. A young 18 year old male is seen as more independent. Pretty sad.
Its fine to date anyone as long as they're above 18 years of age or above age of consent.
Probably where you are? But generally speaking, men dating younger women is historic and traditional and still seen as acceptable while an older woman dating a young guy is seen as inappropriate. As long as the there is age of consent, common sense, maturity, no toxicity or abuse.... to each his own.