Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE gymnast ( gymnast_id number, floor_exercise_points number, pommel_horse_points number, rings_points number, vault_points number, parallel_bars_points number, horizontal_bar_points number, total_points number )
TABLE: CREATE TABLE people ( people_id number, name text, age number, height number, hometown text )

### Question ###
What are the ages of the gymnasts, ordered descending by their total points?

### Accurate SQL ###

SELECT T2.age FROM gymnast AS T1 JOIN people AS T2 ON T1.gymnast_id = T2.people_id ORDER BY T1.total_points DESC