Hi Darlene,
Welcome to Thalpal.
No, it's not true. Exjade can be used with person of any age. All she is saying is not true.
What's your son's weight?
You can continue Exjade as per 30mg/kg.
Also split the Exjade dose in half, taking one half in the morning and other half in the evening to achieve 24 hours chelation. Myself and a lot of people here take it in split dose and are already achieving nice result with it.
My ferritin 4 months ago was 5982, and as per recent report, it's 5354. It's showing constant decrease now.
Do let us know his weight and his current dosage; don't worry, the ferritin will reduce.