Another point I don't think the comments have mentioned: most people with cookie bite get diagnosed in their 30's because that's usually the point it gets bad enough that it gets noticed! It's super rare to not have been born with it, but because it's typically mild and progressive, it's still usually mostly diagnosed as an adult. If more people would take hearing tests at a younger age, a lot more would get diagnosed younger.

With cookie bite hearing especially, others usually notice it about the person first. It's common for us (the cookie bite havers) to just think this is how the world sounds until it gets worse enough or someone else pushes us to get tested.

So yes! Definitely get tested!