People did research on memorizing different kinds of things but testing it on different kinds of age gaps. When people age their short term memory slows down and becomes less effective. Each memory people made during the span of lifetime is encoded within their neuronal connection. Short term memory is described as forgetting the facts that were told a few minutes ago. 

One of the examples of memorization is musical memorization. A lot of people have been memorizing rhythms of notes and sound for a long time. The reason why people usually memorize music is because to perform and do different kinds of stuff with that. A different example of memorization is visual memorization. People show the musicians pieces to memorize and he if they do. Visual and auditory memorization are the common way music is memorized. There are lots of more examples of memorizations than the examples I wrote about. 

Reference: View of the neuroscience between musical stimulation and enhancing short term memory with age. (n.d.). https://www.jsr.org/hs/index.php/path/article/view/497/210   

Image source: https://meteoreducation.com/neuroscience-in-classroom-practice/