A deck is old when you think it is old. haha
Basically, if you dont like the way it feels and it doesnt seem as good as it was before, then its old. the point where you get fed up of it is up to you.
Ways to extend a decks life:
- try not to handle a deck with oily, wet, dusty, or dirty hands
- try not to drop them / throw them as it ruins the edges and corners
- keep them in the box when not in use as it prevents dirt, dust, and moisture
- use a card clip or card press. It keeps them flatter than out in the open.
- try putting a deck in the fridge, freezer, infront of an AC, or out in the cold for 10-30 minutes or so. It takes away some of the moisture and the cards will feel a lot better. But if you leave it in the fridge for too long, it gets soggy, so watch out for that.
- use fanning powder for old decks, kinda fixes it up a bit