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I have a 1.5-year old and we bought 25 kilograms of used Duplo (toddler safe, bigger Lego from the same brand). There are bricks from the 70s, 80s, 90s, 00s and they all still click together well and have barely faded in colour. The quality of this stuff is amazing, and it still is judging from the brand new bricks we got as a gift.

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I agree, we are big lego/duplo fans in my family as well.

Just a little safety warning that old legos, especially 70s (and older I guess) can contain toxics in the colors like cadmium. I am not qualified to say how large a risk that poses. The risk of choking is probably larger?

A more positive side note, have you seen that you can order separate bricks from all newer lego/duplo kits? You just search for the name of your kit and get a list of all the parts it contains in the lego support. It is not cheap, but a great service.

Incidentally, Lego and Duplo are compatible!

So eventually you can use the Duplo blocks as large building blocks under more intricate Lego designs.

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