Time Travel utilizing gravity

This post is a random musing, so do not read it if you are looking for something witty or clever. I will never post something that I learned from a book or heard from a professor, but came up with on my own. I may have verified it before posting. But copying something that I got out of a book would evade the purpose of posting these random musings.

When you walk from point A to point B in a straight line, you are taking the shortest distance between the two locations. Though this is the straightest line, the earth is obviouslly curved, so you are not truely taking the quickest course, but the shortest geodistic route. Light and time work the same way. Light will continue forward unless influenced by a means such as gravity, in which case it bends. For this reason, since a black hole's gravity is so strong is such a small space, the light around this black hole will be sucked into it. Albeit minor, the earth does the same thing to light, bending it ever so slightly as it it passes by. The closer the light is to the gravitational force, the stronger the bend will be. For this reason, an observer high above the atmosphere will look to the earth and things will appear to happen slower on the surface. This is called the "twin paradox", in which two identical twins theoreticlly live on different altatudes. The one who is higher will age quicker, although the amount of change is very minute. This was proved in the lader half of the 20th century, with two very acurate clocks and a water tower.

This implies, which was later proved, that an object moving closer to the speed of light will age much quicker. Therefore if a person left earth close to the speed of light then came back several years later, only a few moments will have passed on earth. This is to say, the faster you go, the slower time is.

My hypothesis, is that if we create a near infinite amount of gravitational force around us, we could slow the passage of time, and age slower than someone outside of the gravitational bubble. This does not mean that a person inside the bubble will live longer. They will just age slower in relation to everything outside of the bubble, since time has been proven relative. Additionally, I hypothisize that the amount of change between time passage between the twin at the bottom and top of the water tower, will be proportional to the time it takes for light to travel between the two people with the force of gravity in effect.