I think the age would mostly be around 2 years of age. Remember, most thals start blood transfusion after 3-6 months of age and have to go through around a year or year and half of chelation before their ferritin levels reach around 1000. I have heard as a general rule, patients should begin iron chelation treatment once they have had 10-20 transfusions, or when ferritin levels rise above 1000 - so age is not the first factor to look at, instead it should be the ferritin levels and the number of transfusions received