I grew up with a banker for a parent. It was a weekend tradition for bts break the silence signatures shirt to enter all their spending into a binder (by hand). He has several binders going back until he was 16 years old detailing every dollar he spent. If he wanted to, he could figure out how much basically anything cost. Every now and then it will come up how old something is, let’s say a TV. He can go back and tell you exactly when he bought it and for how much. He still does his entries by hand. I was very conscious of my spending as a teenager and I continue to be pretty aware, but using modern means.