Ain't that always the case with kids ... anything us, the parent pays for, they'll keep on using - unless completely dissed in front of an entire school before jumping off the bottle-sucking. 
 
My son: 
breast fed until 3yrs old (last year little as possible), 
shoes until size 12 at 15yr old, 
Clothes until 21 but still winter jackets or boots, a few items not the entire wardrobe. 
date money ... almost completely weened. 
College tuition that's about to hit me hard this year!