I found myself forgetting the important details of many famous books I read as a kid/ teen (Jules Verne, Daniel Defoe, JRR Tolkien etc). So I decided to re-read as many of them as possible.
It's not just about filling the gaps in my memory. From an adult perspective now, I am finally able to understand the more delicate undertones which escaped me when I was younger. Also it's interesting to see, how feelings and personal development alter your view on things.