There is a website called CougarLife, which is supposed to match cougars and cubs. A quick Google search shows website results with the feedback that men greatly outnumber women on CougarLife and that it is mostly a waste of time.
Both of these paths are unlikely to happen for most men. The only men who might get approached by some higher sex drive women seeking younger men are men in the 90th percentile + in looks. Also these men are likely under 26-27. You've likely aged out of that category by now and aren't good looking enough for that to happen.
A man seeking an older woman might get fortunate enough with approaching strangers to make it happen. It would take a lot of approaches, a dynamic personality, and better than average looks. This is most likely to happen in a bar environment but there are a few non-bar environments where it could also happen.
Generally speaking, it's going to be more difficult than average to find a 45-55 year old who is...
- Unattached and available
- Not seeking a longer term relationship
- Open to men 10+ years younger
A woman possessing these 3 attributes in that age range is rarer.
It's less common behavior for younger men to lust after women 10+ years older.
I tend to give much younger men (18-25) a bit of a pass on doing that if it is a shorter term thing. It is best for younger men to seek out young women close to his own age. However, it can be an interesting life experience to have sex with an attractive, much older woman (think 33-44) while he's still in his late teens/early 20s for a short period of time. When a man is 26+, he has enough selection of younger women near his own age.
The gynocentric social order in Western nations does give older men a rough time for dating substantially younger women.