Pends through whose eyes you see things though, don’t it?
Lots of things have happened all over the World throughout Human History. To limit things to suggest just one era in recent Western History is a tad limiting. There is radical change happening in places like China, India and the Middle East, whilst people in Chile might consider the end of the reign of the dictator Pinochet to be their coolest era.
The 60s in the UK was when the media really came to the fore as helping define contemporary culture in a way never seen before. So, an important era in modern British history perhaps. But ‘cool’ is as subjective as the viewer, surely?
For me, the explosion of Jungle and later Drum n Bass music was cool, as it came from where I do. Nice to see a culture born of your own environment and experience make it into the public consciousness.