Response to Veronica:
 
You can best determine their age by the condition of the ferret's teeth.
If they are pearly white with no tartar, i'd say a good guess is 1-2
years.  If they are starting to yellow a little i'd say 3-4, Ferrets
whose teeth are starting to look on the opaque side or transparent and
losing the solid whiteness are generally 5 and up.  If teeth are really
transparent a good guess is 7+.  Is this about right ferret folks who
posess more knowledge than myself?  Input appreciated!  Hope this helps.
 
Kim at SUMS
[Posted in FML issue 3938]