LOL, Echo Lake area, and Sunset Boulevard aren't really themed lands. They are just generic terms for areas of the park. The attractions in each section are a mixed bag of different things that aren't related at all. Indiana, 50's Prime, Star Wars, Frozen, Aerosmith, Tower, Beauty and the Beast, Fantasmic.
Even if they were at first loosely based on decades, they aren't anymore.
Indiana (1980's - present)
Star Wars (1970's - present)
American Idol (2002 - present)
Frozen (2013 - present)
Aerosmith (1970's - present)
Tower (1950's - 80's)
B and B (1990's - present)
Fantasmic (1940's - 2000)