Guild Wars 2

Do you get higher XP for quests, kills, and events the higher level area you are in?

Yes………………………

Events do scale with your level, and scale a bit more strongly with with the level of the area.

On my level 80, for instance, doing an event in Queensdale or another 1-15 area will generally give me a bit over 3,000 experience. Doing an event in Cursed Shore, or the Claw of Jormag event in Frostgorge Sound will give me over 17,000 experience. Other areas range in between.