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The colouration of the opisthosoma (abdomen) make me think it could be pre-molt, however the best indication for a young Avicularia would be dark lines on the legs. Avics tend to be shy, so its your best bet to leave feeders with them for 24-48 hours and see if they eat.
i left 2 mini mealworms in there in case it decided it was hungry later.. at the moment its just perched on top of the wood hanging out.. i guess ill just keep checking over next day or 2 and see if it decides to go after them or just remove them and replace with new if it doesnt.. i could get a really good close up pic while its at the top of the wood if you wanted a better view of it =)