You are probably looking for date_part().
E.g.
SELECT date_part('year',age(birth)),* FROM persons LIMIT 1;
Troy
>
> I have a table containing the birthdays of various persons. The target
> is to compute the age of a persons.
>
> persons=# SELECT age(birth), * FROM persons LIMIT 1;
> age | id | name | birth | gender |
> income
> -------------------------------+----+--------+------------+--------+--------
>
> 31 years 4 mons 16 days 23:00 | 1 | Albert | 1970-01-01 | m |
> 35000
> (1 row)
>
> When I use age() I don't get full years. Is there an easy way to round
> ::reltime off or up without writing a function. Is there any possibility
> to use plain SQL only?
>
> Hans
>
>
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