If you are 70 you can find all the Legendaries, and they will be always level 70.

Legendary Items - they are the standard version of your Item, which has a minimum level and scales with your character's level.

There are several Tiers of Legendary Items which are: The level of Legendary Items scales with your character level (or maybe to be more precise, the level of the area you are in). Legendary Items, right after Sets, define player's builds and your overall gameplay experience. Legendary Items can be found anywhere in the game, with some Legendaries having very low-level requirements.

Legendary Items in D3 have much higher base stats than Rare Items and they usually possess powerful Legendary Powers, greatly increasing certain Skills Damage, or providing other amazing Utility Perks. Legendary Gear has orange/brown name tags, and when you find one you will definitely hear it, alongside an orange beam of light which originates from the item. Legendary Items (often called the 'Legs' or 'Legendaries') are the highest quality items available in Diablo 3 and D3: Reaper of Souls.

Diablo 3 primal ancient