The 21st century seems like it just started, but we’re already half way to 2030.
Remember 1995? The way we thought of the 60s then is how someone who today is the age you were then thinks of the 80s. The way you thought of the 70s then is exactly how far in the past the 90s are today.
How about 1980? It’s closer to FDR, Churchill and Hitler fighting each other than it is to 2015.
The perspectives given by classic movies hurts just that little bit more than you’d expect, along the lines of XKCD’s movie age chart (which is now 4 years old).