[Ron]

If that's a 5ml spoon, I'd say the larvae in the pictures could be anywhere between 2 weeks and 4 weeks old. It's really dependent on factors such as temperature, food quality and food quantity and genetics. Also, bear in mind that the difference between siblings in the same container, given exactly the same conditions and access to food can be quite unbelievable sometimes.

My 1st batch of larvae (now 3 months old) varied immensely and while about half of them had well developed front legs at 5 weeks, others took as long as 7 weeks to develop their front legs.

The same batch right now have a few individuals starting to use their back legs for walking, while some don't even seem to have back leg buds and are almost indistinguishable from the biggest of my 2nd batch which are 2 months old.