There was this book from the 70s or something, bemoaning our throw away society. It made the case that our attachment to personal items gave us a sense of continuity that we need. Some generations inherited clothing, some inherited the crockery and cutlery. The book is "Future Shock" by Alvin Toffler.
So in this spirit, which are the things you have used the longest? Your grandmothers plates? The dustpan and brush you've had for 40 years?
This is not a list of things you keep for sentimental reasons. You need to use them.
1. The toothbrush
The reason I replaced it is because the bristles were starting to fall off. You can see in the picture that it's worn down and there are some spots where the bristles have fallen off.
But, other than that, it was still working fine. So I bought a new one so I don't have to throw away an old one that works fine.
I think my grandmother gave me this toothbrush when I graduated high school (1985). So 34 years ago she gave me this toothbrush and now I'm using it 34 years later.
I looked at Amazon and they sell them for $6-$8 but they don't say how long they last.