Is it possible to lose all knowledge if one stops learning?

I think not really going to lose all but more studying will help, and not learning for a long time maybe because of One challenges, frustration or something else, can make one forget about what they learned but not going to forget all but will not remember it fully unless another person is there saying it and it will make the person to be remembering it. But if it handwork example,…. “technician”, mechanic,no matter how long they can never forget that which they learn. Unless too much drug can make one will is a book lover to read, that which we read and stop might be hard to remember if we stop reading. I observed that in terms of what we studied in school, life challenges and mental problems can make one forget about it unless they came across the information or the book again will bring the memory back, but anything handwork it’s hard to forget.