Oldies

When you think of oldies, in regard to music, which era/decade do you think of? The 50's? The 60's. When I think of oldies, I think of Motown, The Temptations, The Supremes, Smokey Robinson, The Four Seasons.  In the 70's, my friends and I called the 50's and 60's, oldies. Maybe the 50's were, but I don't why we called the 60's, oldies. Most cable TV services have music channels. Ours has about 30 music channels. They have a channel for the 80's, 90's, 70's, and...Oldies. Does that mean that the Oldies are classified as their own genre? I was wondering about all this because just the other day, somebody said the music I (ME) grew up with, IS the oldies! Na ah. So I looked it up. Wiki says that "Oldies is a radio format that concentrates on music from a period of about 25 to 55 years before the present day." 
Wait. So the music I grew up with, mid 70's, became 'oldies', technically, in about the year 2000. SIXTEEN YEARS AGO???? I forget how old I am allll the time.