Adding header nam to any table

Hi!
I am using postgresql with PHP and C. Is it possible to add header
information to every table? For example:
id | name | age
should be
User ID | Username | Age of user
This should be displayed, when i query the header information. Is this
possible? Maybe i can add a comment to every column header? Or is there a simple
way for storeing this additional information in a other table and solve this
problem by writting some special SQL statements?

Thanks!!
cu

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