duration of cards

[Mike]

Hey guys,

I have some questions about the aging of decks:
-how can you make your deck last for longer and maintain the good handling??
-how can you keep it clean?
-how long can a deck remain fresh??
-where is the best place that I could keep my cards??(should I leave the cellophane on?)
and a random one....
- WHAT'S YOUR TWO FAVOURITE DECKS??(or one...:P)

Thanks a lot!!

Michael