you can see bye the size of the animal if it is small then of course it is still young and if it is large then it is older like 20-25cm is 2 years about.
But you never fully know how old it is unless you had it from day one you can try asking the person you bought it from or your local reptile vet and they can give you an approximate answer.
Usually you can tell if your bearded dragon is a boy or a girl in the first 3-5 months.
Look at it
you can tell if your bearded dragon is limping or his tail is croocked at a weird angle. if you do find those symptoms take you bearded dragon to the nearest vet with a expert on reptiles for this deasease can be fatal if not treated and cared for.
it doesnt matter what age you are, everyone can get salmonilla from a bearded dragon. but you can wash your hands and you wont get this disease.
Bearded dragon nails should be trimmed when they become too long, usually around 6-8 months of age.
Finding out the gender of a bearded dragon is simple to do. All you have to do is lift up the tail if there is a slit then it is a boy.
You can tell the gender of a bearded dragon by looking at the size of their pores and the shape of their tail base. Males typically have larger pores and a wider tail base compared to females.
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I can't tell you everything that can be housed with a bearded dragon, but in the local pet store the owner does a boarding service, the other week I saw a tortoise and a bearded dragon in the same cage from the same owner, they live together in a vivarium and get on well.
a bearded dragon
A bearded dragon typically stops growing and reaches its full size at around 18 months to 2 years of age.
Definitely a bearded Dragon, they are much more a tame and active in the day. A beardie will cost you more but i can tell you they are amazing pets. :) P.S I have 2 crested Geckos and 5 Bearded Dragons