system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How come we can enter a password for years but forget it just when thinking about what it is?
gpt
Because you enter the same password every time it is required (if you use the same password for everything, which most people do), eventually it becomes part of your muscle memory, where you don't even have to think about what you are typing, you just do it because you have learned that it will get you to where you want to be (logged into whatever program/website required the password).

Because of this, pretty much the only time you really think about what your password is was when you created it initially, which for most people was several years ago, which is why it can be hard to remember when you aren't actively typing it.