SCCM Report to determine machines to be refreshed

I'm at my wits end here, PLEASE Help.  

I have to generate a report that shows machines older than 3 yrs, so that they can be replaced.  I've tried going by the BIOS date but this doesn't look quite right, I've tried going by the CPU Birth date, but not all of the machines return a value.  I need a report that will scan all laptops and desktops in a specified group, and return the Netbios Name, User, Manufacturer, Model and age.  Please please help.  If need be, I can create an Excel spreadsheet that ties the model to a static age...but if SCCM 2007 can do this automatically that would be SO much better.  Help me're my only hope.
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There may be a simple answer for you...

The problem with determining age of equiptment is that parts can be upgraded or firmware can be upgraded that will overwrite date... for example a firmware update will change the bios version or date...

So, once solution might be to look to the built-in reports...

there are reports with a catagory of Upgrade Assessment -Windows 7 that might help...  These evaluate the hardware in the system and figure out if Windows 7 will run on it.  computer 3 years or older might be rejected by this report...  you can edit the report SQL statements to get the reverse effect...

I would copy the Computer that do not meet the minimum system requirements for Windows 7.  then edit the report to modify the values...
Here is some more information from Microsoft of determining age... largely based on processor: Asset Intelligence Whitepaper FINAL v4.pdf

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Xeif3rAuthor Commented:
Ended up doing it based on the BIOS Manu. Date.
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