I read that one of the best ways to preserve a seed phrase is to write it on a piece of paper and keep it in a safe place... Somewhere safe could be in your home out of the reach of family members and friends, it could also be a safe deposit box. But not everyone are financially buoyant to afford the services of a deposit box.
I believe we must have seen or heard about fire outbreaks, where buildings are completely erased by fire. Imagine if the owner or occupant of such a building has some Bitcoin assets, and has his/her phone, tablet, laptop and the seed phrase piece of paper in the building and everything was lost to fire. Now, this brings me to the question... Can seed phrase be memorized? It's advisable to memorize seed phrase?
I doubt you can have it your mind for a very long time, as older as we can get we tend to forget many things, we also begin to forget little by little, our capacity to memorize and retain every single details on our mind gets narrowed. It is better to write it in your notebook or journal or make a thing that will signify the word you are having in your keys. It is good to memorize it but how long can you keep it?