In Star Wars Episode II, when Kenobi came to know about outer-rim, he also came to know that outer-rim is 12 parsec away.
12 parsec = 12 * 3.26 light years = 39 light years (approx.)
According to Einstein, nothing can move faster than light. We can't deny it even in front of advance technology of Star Wars: we can find spaceship speed equal to light speed after turning on hyperdrive (see last scene of Star Wars Episode V & more).
So, it would take at least 78 years for Kenobi for full return journey. But, everything happened very fast. There was no age effect on Kenobi. Even if we consider time-dilation effect, there should be age effect on others (who were in Jedi Temple & Senate), but nothing happened. Everything was quick. How is it possible?