If it's not disposable, it's not bad.
As to plastics from plant sources, it seems that a lot of what we do use for disposable containers and packaging are a better fit for those sources considering how well they break down. Of course, this all assumes that proper landfills are used and it isn't just shipped out of the country of use.
I've also got some bricks that are much older (from the 60s I think), and are still usable. They haven't spent time in the sun, so they are not even discolored.
I’m not sure what we will do with it when they pass, it has little or no value.
Perhaps it would make sense to recycle it.
Or, donate it to a school or charity shop (thrift store?).
That you don't want to realise the full value doesn't mean it has no value.
Don't just throw it away.
I shall try but I'm sceptical there is much interest in a pile of unsorted 1970's Lego. I could be wrong though.
https://www.vocativ.com/underworld/crime/lego-heists/index.h...
You are so wrong about that. Vintage sets go for many times their original worth, and some parts are worth more than you'd think reasonable for a little piece of plastic.
Prices on Craigslist in higher cost areas tend to be higher, as usual. If you live in a higher cost area, buy on Ebay, sell on Craigslist.
all parts are worth more than I’d think reasonable.
The lego pieces today feel a bit better and are easier to connect and pull apart. But I do not like the way Legos transitioned into Collector-Pieces/Merchandizing toys. There's just too much of it and most of them limit your fantasy.