I have diaries from teenage years, especially age 15+. I spent a year abroad and tried to detail it pretty meticulously, and came back senior year still in the habit. Of somebody as high achieving as Kavanaugh, this is not surprising at all. I’ve kept all diaries from age 13 on.
I’m doing some genealogical research on our family. What I would give to have a treasure trove like my Mom’s diary or her Mom’s or even further back!