I think yes or or no. If you think of the brain in the terms of a computer.
There is the part of the brain that runs all the functions of your body. That is like a core memory system. (Forgive me, I’m not very savvy when it comes to computers).
You also have external hard drives
They hold information (Speech, abilities, people, learned academics and long time memories of places and people)
Then you have the cache, which retains temporary information. What you ate, where you went a week ago, and what appointments you have coming up and what I’m going to type right now. The cache helps things to flow easier so you have quicker access to certain things, like tapping into math skills, or the use of speech. But it is not long term memory. I think most of us use it to learn new things but it requires time and multiple times to use a new skill to retain it and store it in the external drive.
Most of us only use it the most to help store to our hard core memory when young because of our curious nature. As we age we lose curiosity and don’t make a real effort to learn new things. So it’s stored in a temporary file and not necessarily deleted but never properly placed so its like fragmented storage. We don’t have a defragger in our brain to organize it all once a week or month, so it sits like garbage somewhere.
Then there is aging. Where like a computer, things get damaged and not repaired as quickly, until we have a hard time even using the cache.