While I’m not the oldest of my cousins on either side:
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On one side I’m the oldest who is still in touch with the family in general and has children. So I am now the “heir” to various memorabilia which gets passed my way.
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In the other I am the only surviving male-line cousin so something similar is going on.
Let me tell you, I got a lot of cousins and, based on birth order way back when, ending up in this situation was unlikely. But stuff happens.