A couple popular (untrue) twinkie facts: 

~They remain edible for anywhere between 50 and 100 years. 
~They have a shelf-life that lasts longer than their cellophane wrapper. 
~They are not baked, but instead they are made through a chemical reaction that makes produces a foam. 
~They contain a chemical present in embalming fluid. 

Contrary to popular belief (and the movie Zombieland!), Twinkies only stay good for about 25 days. That's still very long for a cream-filled pastry. That's because Twinkies don't actually contain any dairy products. 

Check out this link.