Quote Originally Posted by BabaYaga
Quote Originally Posted by Ramil
Quote Originally Posted by challenger
Прикольно is an adverb from the noun прикол. It's a slang and the most close equivalent in English would be: Cool!
Used only by the young? Or by anyone? ("cool" is rarely used here by people over 20...)
Raise 5-10 years. It's quite common among people under 30. It may be occasionally used by the elders but rather seldom.

Often the meaning strongly depends on the context and intonation and may vary from "COOL, WHAT A STUFF!" to "NOT A BAD PIECE OF SH@T". Slightly positive (or humorous) in all cases but tends to be neutral most of the time. Not offensive.