The gap between good and bad platforms here is whether the ratio is workable in your area.
My first week on women looking for younger guys typically looked promising; by the second I was only really watching what the platform can see that you cannot.
Assuming you are not paying, whether people reply or just collect matches is where the platform gets tight.
Your mileage on women looking for younger guys typically will vary by city more than by anything else.
The closest alternative I found was the Turndate boards.