Adult betta fish, specifically the males, will grow in the majority of their fins as juveniles. When you see bettas in the stores for sale, they are typically around 2 years old already since it takes time for their full finnage to appear.
You would surely be aware if Bettas have been spawing in your tank. If they have, and nothing else has been spawning in there, then in all probablility the tiny fish you can see will be Betta.
Determining the age of a betta fish based solely on its appearance can be challenging. However, you can generally distinguish between adult and juvenile bettas by looking at their size and fin development.
It is pretty hard to tell. Wait until they get older then see which ones have longer fins, and shorter fins.
It's all in the tail. the males is larger and longer and the females is shorter.
their colors dull. for example, instead of bright purples and blues, they would be a dull lavender or baby blue.
the size of it's fins and body
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It is too low if it is below 24 or even 26 degrees celsius. A thermometer will let you know if it is in too cold for your betta.
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A girl Betta is dull and not as pretty as the male. But, a boy Betta is colorful and pretty to attract the female mate.
There are multiple diseases that can be inflicted on a betta. You can search on the web for some of the common diseases found in fish.
it will always be at the top of the water with the upper side of it turned down