3 Answers

Red is 8 years old, and not very good. Black label is a delicious 12 year blend, a respectable scotch Green label is an interesting 15 year blend Gold label is 18 years, and quite good Blue label is not designated by age, but rather is a blend of the rarest and finest scotch whiskys available at the time of distillation, it is highly sought after and very, very good.
There are also specialtiy brands, such as Blue Label: King George V edition, but they are just re-bottled versions of the common labels, sometimes with special blends/aging processes added.

I know of 3 Red--Black and Green.. when my family owned a restaurant it had a 'cocktail bar'  we used only Red and Black--  Customers would specify by ordering JW Red/Black..  Personally, I don't like the taste of any liquor but when I used to drink scotch, I drank chivas regal or dewars scotch-- Both rot gut.. LOL

Three, but Red is the best! https://www.youtube.com/watch?v=Ua_oYGxXi4k