There are exceptions, sure, but life should be an upward trajectory as you gain experience and wisdom (something many people refuse to do).
As time passes, I think you'll find that happiness comes in sufficiently varied flavours that it's quite possible to have a favourite decade that isn't the present one, and yet still feel more contented, satisfied & wiser than you did during your favourite decade.
If that seems paradoxical to you right now, just give it time.
Anyway, I choose the 1980s.
And cooleddie's line about that decade is just awesome.
