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 table_14946657_3 ( median_income VARCHAR, age_band VARCHAR )

### Question ###
Name the median income for age band being under 20

### Accurate SQL ###

SELECT median_income FROM table_14946657_3 WHERE age_band = "Under 20"