ive got 2 Beardies. one is 21" one is 17". You should be feeding him/her greens once every day, a sall hanfull should do. If the bd eats all the greens feed them more next time. As many greens as they can eat is good. And now that your lizard is getting older, it doesnt need as much protein, id say 3-4 doz large crickets a week is good.