Give the guy a break, he aged at least four decades on only 19 years.
When you look at the ages of the actors who played him and consider that people’s skin age faster under harsh sun, the discrepancy shrinks. If you make the Clone Wars longer (three years is too short for such an epic, galaxy spanning, Republic destroying conflict) Owen and Beru’s ages make more sense in the PT and their apparent age in Ep 4 no longer is off at all.