It does tend to be older men with younger women.
But I think that is, slowly, changing.
However, older men with younger women are called creepy, or delusional, not able to manipulate or impress and older women who are more sure of themselves. Or even so wrapped up in looks they cant look past a woman's body. and the women with them questioned if they are gold diggers.
Yet women who date younger men are celebrated. They can say things like 'the sex is so much better than with older men, as they can go for hours' or 'why would you want a man in his 40s when you can have a younger, fitter whose erections are harder' (i have seen both these comments on MN). I have seen in mn women actively encouraged to go out with a much younger man they fancy, egged on and celebrated. While women who ask about fancying a much older man receive less enthusiasm.
It seems acceptable for women to not want an older man or comment that all older men are shitter in bed, their bodies arent as good etc
The younger men are usually lumped in under the umbrella of simply likeing a woman who is more sure of herself and confident. Rarely, called gold diggers and the like. It's more around how older women are better.
If men said that older women, werent as attractive, have crap bodies, shit in bed, low sex drive etc there would be a huge backlash. I get that they do. But it's not socially acceptable to say and definitely not on MN.
While there is more older men with younger women. I do find older women with younger men are seen as brilliant and amazing.