The sharp-eared peasant (Multiverse, Mass Effect/Dragon Age)

The soul of a young elven mage (only a thousand years old) enters a human body in a world parallel to ours (with minor differences). The only problem - he lacks magic and longevity, and locked in a body of a human, which only have a measly forty years of life. A brief moment compared to the lifespan of a firstborn, in which he must regain at least one of two things: magic or longevity.