Perfectly realistic goal. The field is huge, and if your willing to relocate on the international scale, then number of opportunities will appear endless.
I returned to education after 6 year out in the real world and am currently halfway through (B.Sc) Physics, my main advantage over everyone else comes down purely to the fact that by being older, I have more actual experience, which has put me in a better position to research, identify and meet my objectives. I scored firsts with >80% in all exams and I would put it down to a maturity, that is invariably crucial in the sciences when considering systems, structures, concepts etc...