Depends on various factor size out of the egg, feeding frequency etc
An hatchling can hatch at 35 grams and take several weeks to reach 110 grams because it is smaller and get smaller size prey, while another can hatched at 90 grams and be that size in 2 weeks which would put his age at a month.
An animal that was not well cared for could be several months old.
Asking the age / hatch date is the best way to know.
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