Fibroma is neurofibroma. How old a child can tell if a coffee spot is a neurofibroma is uncertain, almost all cases are visible at birth with skin milk coffee spots, and more than 6 >5mm skin milk coffee spots before puberty (>15mm after puberty) are highly diagnostic.
Both neurofibromas and café au lait spots are benign conditions. Almost all neurofibromas are visible at birth, and more than six >5mm coffee spots before puberty (>15mm after puberty) are highly diagnostic. Both can be recognized by pathological diagnosis. Therefore, whether coffee spots can be seen as neurofibromas or not has nothing to do with age.
In the case of simple café-au-lait spots, laser treatment can be used. If it is a neurofibroma, it needs to be removed by surgery.
When coffee spots appear in children, it is recommended to go to the hospital in time. It is also necessary to observe the changes of the body in daily life, and usually go out to avoid ultraviolet radiation as much as possible.