It is not the age that matters when introducing leos into the same enclosure, it is the size. Sub-adult or juvenile leos will be bullied and maybe even killed if introduced to a colony that consists of leos twice its weight. Wait until it is about 2 years of age at least before introducing them into the tank. In order to house 4 geckos, a 40 gallon is required so that there will be no competitions for space and hides. I personally, do not like housing leos together.
If housed together, leos will have to deal with fighting, bullying, competition, parasite transfer and stress. And if you are trying to breed your leos, it is not about age again, it is weight and size. A healthy female breeder should be 50-55 grams and properly supplemented with calcium. A healty male breeder should be around 40-60 grams and its a good idea to give him vitamin supplements.
Hope i helped.
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1.1 Green Iguanas
1.0 Bearded Dragon
1.6 Leopard Geckos
1.0.2 Pictus Geckos
1.0 Flying Geckos
1.0 Emperor Scorpion (R.i.P)
1.0 Brazilian Rainbow Boa
0.1 Costa Rica Zebra Tarantula
1.0 Cornsnake
0.1 Ball Python
0.0.1 Cuban Treefrog
0.0.1 White Dumpys Treefrog
0.0.1 Pacman Frog
0.1 Cobalt Blue Tarantula
1.0 Sulcata Tortoise
(thats it for now)

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