Time Travel, Anti-Aging And Aging

Changing $v_t$ makes time travel possible.  Returning $v_t$ to its nominal value under gravity, $v_{t,earth}$, returns us to the present reality.  Setting $v_t$ higher than $v_{t,earth}$ drives us forward in time, and setting $v_t$ lower than $v_{t,earth}$ brings us back in time, as time for the rest of the world launches forward.  In both cases, we disappear from the present reality.

Setting $\cfrac{\partial}{\partial t}=0$ makes freezing you in time possible, irrespective of $v_t$.  Setting $\cfrac{\partial}{\partial t}=\cfrac{\partial}{\partial t}_{earth}$ you move normally with the rest of the world on earth.  Setting $\cfrac{\partial}{\partial t}\gt \cfrac{\partial}{\partial t}_{earth}$ you move faster than the rest of us and age faster...

For all possible relative values of $\cfrac{\partial}{\partial t}$ we are still rooted in the present reality.

Just thinking out loud...as for reverse aging...