Can you reduce age in Fable 2?

Give people to the temple of Skorm, and donate certain amounts of money to the Good temple

You cannot find your age any where on the game, but you can follow it through the story, the age is not told if you sacrifice your age to the shadow court.

yes.

You have to eat healthy foods. When you make a purchase, you can view how fattening each item is. The different types of celery have negative fat values and will help you thin out if you had to many...

No, but you could follow it if you listen to the story.