There's muiltiple parts to legacy. There's the actual legacy option, which would've required you to have paid for a certain amount of time in 1.0 (you'd see this on your account page if it is active), then there's the other half which was a mount if you'd done the quest in 1.0 and the legacy mark if your character was around 10 or so at the time of server closure.

Characters at trivial level were not transferred. Characters created after the 1.0 series are not eligible for the mark. So if you just picked up the game and put it down after an hour, you have no way of getting any legacy anything-- no matter how old the account itself is.