Up to 1 year is a calf (red deer are not generally called fawns on Exmoor)
Up to 2 years is a Kobber, Knobbler or Brocket.
A Spire or Pricket is up to 3 years and a Staggart is up to 4 years old.
A stag or warrantable deer is over 4 and a Hart is older still. A “Hart Royal” has been hunted by royalty and lived to tell the tale!
Generally females are hearsts in the first year and young hinds in the second.
Both teeth and antlers can be used to age deer; the latter rather more useful in the field!
“All his rights and -so many- on top” refers to the basic antler of the four year old deer, with a “spire” or “beam” of approx. 35cm long bearing the “brow” spike and the “bay” alongside.
At 5 the stag will usually have the “trey”, and therefore full “rights”
At 6 generally his rights and 2 points “atop” on 1 horn, 3 points on the other and by 8 years will have 3 points atop of each horn. These two magnificent stags are at least 8 years old.
Nutrition and health affect antler development and so the above can only be a rough guide.