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Interesting. That should not really be possible, but it is easy to fix.

But first, it would be helpful to see if its possible to understand its cause.

The error is indicating that a non-numeric age has been found. Can you look at Charts > Statistics (from the main menu) and tell me what it shows as the “Oldest living” (could be male or female).

Nigel
My personal kiwitrees site is www.our-families.info