Sawing Old Logs - How long can I wait before sawing logs into lumber?

How long can I wait before sawing logs into lumber? How far gone is too far gone? Are there any advantages to waiting?
I have a stack of logs that have been sitting around for a few years that we can saw to see the results of letting a log age.

Making Lumber: https://www.youtube.com/playli....st?list=PL0dX5redvVZ
Building the Sawmill: https://www.youtube.com/playli....st?list=PL0dX5redvVZ


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