A 12 year old can get a nose job if its a medical condition and is prescribed by a doctor. Otherwise surgeons won't do it until you are 15 or 16 for girls and 16 or 17 for boys. If you do a surgery...
You are never too old to look for a job. Admittedy, more areas will be closed off to you the older you get, but there is always good work to help out in. Even greeters at Walmart are important.