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Its not about how old it is but how big it is, snake can be very hard to sex even as adults. Sexing small animals can be harmful to your snake, probing can damage so can trying to pop the hemipenes, it is much easier to (guess) the sex of snake when you have a number of them together, by compairing tail length, you can determin the sex but this is not always that easy either. Maybe wait until the snake is mature and sexual differance have developed eg, larger spers, hemipene bolge and shoter tail length in males and smaller spers, no hemipene bolges and longer tails in females....OR if you live near some one that can do it see if they can help.
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