DF = data.frame(
    location=c( rep( 'Lakeside', 3 ), rep( 'Deep_Gorge', 3 ), rep( 'Willow_Ridge', 3 ), rep( 'Azalea_Hi11', 3 ) ),
    age=c( 1200, 800, 950,
            850, 900, 1100,
           1800, 1450, 1150,
            950, 1200, 1150 )
)