It's nice to see that you consider websites as reputable sources. I myself will continue to rely on printed sources from long standing names in the industry.

Take a look on day at The Leopard Gecko Manual by Philippe de Vosjoli. They state that young adults can breed at 30-35 grams, but most breeders wait until 40 grams. Not to mention the stated average adult size is between 45-60 grams.

Now let's look at The Herpetoculture of the Leopard Gecko by Ron Tremper. He states a breeding size of 35-45 grams.

The recommended breeding size of online sources has continued to rise over the last 2-3 years. Most likely because newer breeders want to give a safe number and just add 5-10 grams over what they were told. After a few years we start to get people who will state a breeding size of 70-80 grams. That is ridiculous. Most female leos will not get to that size unless they are giants, obese, or they are from a line that has been bred for size. 70-80 grams is outside the normal natural size for a leo. Wild Females do not wait until 70-80 grams to breed in the wild. They are more than able to breed at 40 grams. As a matter of fact, a lot of my females will ovulate and produce infertile eggs as small as 30 grams. They don't have to breed to produce eggs; they only need to be mature.

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