# To Be Forever Young [duplicate]

It is clear from the Lorentz Parameters, applied to Einstein's Equations, that as velocity, v approaches speed-of-light, c, the denominator (1 - [v/c]) tends to zero; when v=c, time, t=0: time stops?!

This accounts for the theory that an astronaut, travelling at almost the speed-of-light, for what he conceives to be a short time, returns to find that x-number of years have passed by, on Earth (bit of a shock).

Is this true; or, is it a quirk of mathematics; or, is it impossible to say?