I've had the best luck on Tinder. I used Bumble for a while, but it felt like a waste of time since women have to message first, and many men either didn’t reply or sent low-effort messages.
Tinder is much better. You can choose from people who have already liked you, so you know they're interested. I've also found a lot more men over 40 on there.
It really depends on where you live, though. In my area, lots of people use Tinder, which definitely helps.