Question
My 10yr old needs orthotics.  I was told they will last about 2 years.  Is that true?  I wonder if she'll outgrow them before that.  What age does a child's feet stop growing?

Answer
This Chicago & Elmhurst Podiatrist says.......

Dear Corinne,

Usually the materials in the shell of an orthotic last for about two years or more. Depends on the composition/thickness of the orthotic/orthoses and activity level.
If the orthotic has a topcover (like a leather or soft covering), the topcover may wear in a year or less depending on the activity level and if it gets wet from moisture or perspiration. Usually kid's orthotics do not have topcovers. If they wear out in year they may be covered by your podiatrist-just ask.
The orthotics are usually made to allow for some growth-so they may last for two years if the foot size does not change much.
These supports need to be made professionally by a podiatrist who is certified in orthopedics or practices orthopedics.  
Please make sure you see your podiatrist. They are the experts in these kinds of problems!
The age of end of growth is usually between 16 and 17.
Also make sure your child does exercises like standing on on foot and doing toe raises- 12 to 20 repetitions 3-5 times a day each foot 5 days a week. He/she can balance themselves by holding on to a wall,countertop,etc. This may help produce an arch as the child grows-it will for sure strengthen it.
Hope This Helps
Good Luck!