Shooting took place from June 26 to September 30, 1997. As with Star Wars: Episode IV A New Hope, Episode I's main exterior filming locations were in Tunisia. The podrace was filmed in a canyon near Sidi Bouhlel and Oung Jmel. A set was built near Oung Jmel to represent Mos Espa on Tatooine.

How old was Anakin in The Phantom Menace?

In 'The Phantom Menace' (set in 32 BBY) Anakin is aged 9 and Padmé is 14. He turns ten during the film. By the time of their (sexual) relationship in Attack of the Clones, (set ten years later, set in 22 BBY) he was 19 and she was 24. The name resonated in young Anakin's heart and soul.

Why does Obi-Wan look so old?

Returning the original point: Obi-Wan has aged so badly because he's using a mass-scale Jedi illusion or mind-trick (or something similar) to block Vader from sensing Luke and himself on Tatooine. The constant years of using the force at a high level is literally killing him.