The following bug has been logged online:

Bug reference:      5728
Logged by:          Dobes Vandermeer
Email address:      dobes.vanderm...@kashoo.com
PostgreSQL version: 8.4
Operating system:   Windows
Description:        Unexpected behavior comparing result of age() to an
interval
Details: 

Seeing some surprising behavior with the use of age() and comparing the
result to an interval:

select current_date,
       age(current_date - interval '123 days') <= interval '120 days', 
       age(current_date - interval '122 days') <= interval '120 days', 
       age(current_date - interval '121 days') <= interval '120 days', 
       age(current_date - interval '120 days') <= interval '120 days', 
       age(current_date - interval '62 days') <= interval '60 days', 
       age(current_date - interval '61 days') <= interval '60 days', 
       age(current_date - interval '60 days') <= interval '60 days', 
       age(current_date - interval '30 days') <= interval '30 days';


Returns:

"2010-10-26";f;t;t;t;f;t;t;t

But I expected:

"2010-10-26";f;f;f;t;f;f;t;t

Something fishy there ...

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