For your question, I remember my first password from when I was ~13 and use it in jokey places, though my longest running password was twenty years, and that’s exclusively for local devices.

On the general topic, I’m a touch typist and terrible at remembering things though I discovered I could learn to reflexively type passwords I did not intellectually “know”.

These days I keep a password tab in my ever on person pocket journal (my persons is security ground zero) of ~18 character highly random strings which I rotate continuously. I find it takes me a couple of weeks to be able to use these passwords without looking (or “knowing” what they are.)

I use one for personal system login, and one for my local only password manager (no lost pass.) All else uniquely keyed within!