One thing is certain you can neither determine the age by size or based on a picture nor can you determine the gender so even if you were providing either it would be impossible to tell.
Understand that size may vary a poor feeder can be 200 grams at a year a strong feeder can be that much at 3 months just like a strong feeder can be 1000 grams by the time it reaches a year.
You will also see some 4000 grams animals that are 6 years and some of the same age in the 2500 grams genetics and feeding or lack there of all play a part.
As for sexing while female gets bigger some male can get pretty big too, and if the female was not care for properly it may have remain small so the option here is to have the animal popped or probed it will depend on the size of the animal and experience of the person doing it, some people have a hard time popping larger animals.
So basically unless the animal is around 60/80 grams you have a BP that is anywhere from 1 to 30 years old and you have a 50/50 chance on the gender.
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