Gotta' add . . . .
If it wasn't for constantly reading CPF,
we wouldn't even know that it WAS outta' date.
Think about it.
Now that you mention it . . . .
My toaster is probably outta' date, also.
Luckily, i'm not aware of the fancy new models.
It should be noted that in an "island survival" scenario, the oldest form of light, the torch, is by a huge margin the most useful.
Unless the laws of physics have changed since you bought the light (and I assume they have not ), then the light is as good as it ever was (if it's still in good condition). That may not be good enough (by today's standards) for you to consider it worthwhile to continue to use it.