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The upper limit can be defined as y = 2(x − 7) in which x is your age and y is the maximum age of your partner.As age increases, the age range of potential non-creepy partners widens. The same also works with infinity, but even Methuselah died once.This means that zircon data can tell us not only when a rock formed, but also when significant events occurred during its life.The oldest zircon yet found dates from 4.4 billion years ago.In a 704-million-year-old rock, 235U is at its half-life and there will be an equal number of 235U and 207Pb atoms (the Pb/U ratio is 1).In a rock twice as old there will be one 235U atom left for every three 207Pb atoms (Pb/U = 3), and so forth.With this background in the uranium-lead method, you may have a deeper appreciation of the research presented on the University of Wisconsin's "Earliest Piece of the Earth" page, including the 2001 paper in Nature that announced the record-setting date.
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But now imagine that some geologic event disturbs things to make the lead escape.