Probably around six weeks old, however ferrets are not good swimmers. They can tire very easily and drown. Most ferret don't like to swim in water.
3yrs old
Black footed ferrets are able to swim
Ferrets can swim, but if they fall into a pail or pool and cannot get out, they will quickly exhausted and drown.
if i were you i wouldnt try to put my ferret in a pool
A twelve week old ferret should be eating a good quality dry ferret food (or moisten food if unaccustomed to dry food). see related question for more information on ferret food
There are several illnesses or disease that a 5 month old ferret can get like influenza, ulcers, stomach blockage
From personal experience - young ferrets are too hyper for older ferrets. Advice from another contributor: Well that depends. Is the young ferret calm and quiet or hyper and loud. is it nice or mean? If the ferret is nice calm and quiet as long as the old ferret isn't mean they should get along fine. is you have a hyper ferret and an old ferret well it could work.
Ferret can swim, but will become exhausted very easily. They are not made for swimming. And some ferrets like to play in water and some don't. It wouldn't be a good idea for a ferret to swim in a chlorinated pool, because they would drink the water and it would make them sick and that wouldn't be good
My ferrets died in their sleep.
you should be about 6 if not if you cant swim use a life jacket if your under this age that cant swim
What did the boys swim in old yeller
The only reason your white ferret is yellow is because the stink glands have been dirtying your ferret. If they haven't been removed, then it is very common. Your ferret just needs a bath.