First Filter
It's complicated. I have two sets of memories in me. In the first set, I went from 1945 to 2011, so that was nearly 70 years.
In the second set, I was awake periodically for missions and then put back to sleep. Knowledge of culture changing and updates with technology were there every time I woke up, but only specific stuff for whatever mission I was going to be on.
And I wasn't really myself, I was this organization's compliant, brainwashed, pet assassin, so some specifics of it was wiped away when they put me back on ice after the mission. Sometimes I was woken a few times a year. Sometimes, years would pass between the wakings. So my knowledge of the world and time is still Swiss cheese.