Greetings,
I think is within reason that you can have a healthy 660 gram male @4-5 years of age.
For comparison: I have a 4 year old male that is currently 849 grams (shown below).
He has a stocky shape right now, however, if he was 'empty', had a slimmer build, and just came off a food strike...I would expect him to weigh much less.
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