This is why Lego costs more.
I have Lego bricks kicking round that i found outdoors in odd places, living in Australia plenty of them were heavily UV exposed. Got bored & did some destructive load testing on one once, the dye may fade the shine may dull and the corners may blunt, but that plastic lasts really really well. I wonder if there's any way to do more advanced stuff like molecular analysis or radiocarbon dating to determine the exact age of the Lego. Shame there's no place i can just mail a chip of the plastic as sample to for it to be analysed and get a report back... well any that don't ask which fortune 500 company/research university pays the bill and charge appropriately.