Get the top row after order by in Oracle Subquery

Question

I have a table student(id, name, department, age, score). I want to find the youngest student who has the highest(among the youngest students) score of each department. In SQL S

Answer 1

In addition to Allan's answer, this works fine too:

select * 
from (SELECT * 
  FROM student
  order by age asc, 
           score desc) 
where rownum = 1;