>>10990121In a physical sense, the amount memories and by extension knowledge you can store is limited by the amount of unique links in your neural networks, which afaik is practically limitless. The more of these that you build up, however, the harder it gets to recollect obscure memories since that means revisiting neural pathways that are structurally similar to a bunch of other ones and might be less connected to your "main" ones - similar to looking for an obscure file in an old folder stored among other old folders.
Also, the more connections you build up the more predisposed you become to register patterns between new memories and old ones, since forming completely new pathways becomes more taxing as you age.