Is there any way to tell age by lenght or weight ? We rescued Steve-o from a local pet store in December. They did not know his age. He weighted 40 grams then and his shed was 28 inches long. His weight on 5/14/10 was 136 grams and he shed 5/19/10 and his shed measured 37 1/2. We are feeding according to the munson plan with a little tweaking when necessary. He has shed every 6 to 8 weeks since we got him. It does not matter to us, we were just curious.