determining the age of a row in postgresql?

[Net Llama!]

I'm pulling my hair out trying to find a means of determining the age of a 
row in a table in a PostgreSQL database.  I've googled, and found close to 
nothing that doesn't require writing crazy triggers or altering the DB 
schema.  Surely this must be possible, right?

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Lonni J Friedman                        netllama at linux-sxs.org
LlamaLand				http://netllama.linux-sxs.org