There is a loose correlation between "smooth" and age. Unfortunately, that also usually correlates to price.
I refuse to pay a hundred bucks for a bottle of whisky, but there are some really smooth malts somewhat similar to the Glenlivet 12 for way less than that.
Dalwhinnie 15 is as smooth as a baby's butt cheek. Balvenie Doublewood 12 is nearly as smooth.
Enjoy the journey!
So many malts, so little time...