Select random sample of N rows from Oracle SQL query result

I want to reduce the number of rows exported from a query result. I have had no luck adapting the accepted solution posted on this thread.

My query looks as follows:

select
    round((to_date('2019-12-31') - date_birth) / 365, 0) as age
from
    personal_info a
where
    exists
        (
        select person_id b from credit_info where credit_type = 'C' and a.person_id = b.person_id
        )
;

This query returns way more rows than I need, so I was wondering if there's a way to use sample() to select a fixed number of rows (not a percentage) from however many rows result from this query.