Sounds alot like the twin paradox and gravitational time dilation - the time difference experienced by the two bodies is due to the speed and relative gravitational exponents they experience - a faster body under more gravitational force ages quicker than one travelling slower under less force.
Yeah, only the fast body, moving around the Black Hole age less quickly, and essentially travel to the future. Or you can just fly at almost the speed of lght, for one week, and see the world 100 years in the future.