I had the same with my pair, they are the same age as yours but couldn't be bothered to eat the small crickets. I now feed with medium size crix as they aren't as lively and find it harder to hide. I could put 20 in my viv and they will scoff the lot. Waxworms are good, calciworms I will try for the first time today.
2 Bearded dragons ( Jaffa and Queenie)
Lime Green Preying Mantis ( Gretna) RIP
Siamese Fighting fish/Betta ( Bertie)
Whippet cross Staffordshire bull terrier ( Brind)
Green Horned Frog (Norman)