How young is too young to treat a child's keloid with radiation?

What dose/fractionation regimen is most appropriate? -i.e. 12 Gy in 4 fractions, but would you modify that approach in a young patient? What is the most appropriate age cutoff? Should it be considered for all patients under age 21? How many non-irradiative options should have been tried prior to? If the parents are advocating treatment, should the child’s opinion come into play? -i.e. Some children may be susceptible to teasing from adverse cosmetic appearances which may drive a desire to try “everything” Are electrons preferred? What about HDR brachytherapy? Is the recommendation for RT location dependent? -i.e. Are there certain locations where radiotherapy should not be considered?