Dont forget to place in dark spot, and/or laser ink.
The inkjet stuff fades over time as well.
Not as badly as fax paper but does not yellow that well.
If filed correctly will last our lifetimes, if sun struck couple of years at the most.
Although I assume if you are papering your wallets you are not going to stick them on the windows to show the world your wealth
Regards,
tacktic.