We all compartmentalize memories to some extent.
Some just do it better than others.
I have vague memories of when I was 4 or 5 years old, but nothing solid.
Once I started school at six, memories increase, and some are vivid.............
Me too. I have vivid memories of the major events, such as the days when loved ones passed away. Also I remember exactly where I was when JFK was assassinated (on a Friday riding the bus from school and my mom telling me the moment I walked in the house), and the first moon landing. I also clearly remember when the Mets won the 1969 World Series