The charts will last for years.
Just don't use them for that long. Get new ones as soon as they're available.
I typically tuck last years chart in my passenger headset bag. That way they've got their own chart and do not have to borrow mine during the flight. Some passengers will actively try to follow the route, some don't bother at all.
(Said bag also contains my old/spare headset, some barf bags, a cheap pair of sunglasses and a spare hi-viz jacket. Typical stuff that random passengers don't bring themselves, but find they need anyway.)