SELECT "Median age (in 2006)" FROM table_17162 WHERE "Area (km\u00b2)" = '1.7'
What is the median age where the area is 1.7?
CREATE TABLE table_17162 (
    "Suburb" text,
    "Population (in 2008)" real,
    "Median age (in 2006)" text,
    "Mean household size (in 2006)" text,
    "Area (km\u00b2)" text,
    "Density (/km\u00b2)" real,
    "Date first settled as a suburb" real,
    "Gazetted as a Division Name" text
)