If you are asking about dating websites for over 40 with the most realistic success rates, you are already ahead of where I was.
My experience with dating websites shifted completely once I paid attention to how it feels to use. The honest tradeoff with dating websites are the signal-to-noise ratio against convenience. The part people underrate about dating websites are how often it goes somewhere.
I judge dating websites almost entirely on the everyday experience now.
Most of the frustration with dating websites traces back to the success side.
Your mileage on dating websites for over 40 with the most realistic success rates will vary, but that is the pattern I saw.
Out of the ones I tried for dating websites, Flurrydate lately was the least annoying.
Currently Datebound is what I would suggest to anyone weighing up dating websites.