Dragon
Dragons are common on Eosayand but on Prukath they are found only around the Fire Islands and Varg where the Dragonborn established colonies.
Lifecycle
For full treatment refer to this article.
Wyrmling
Rarely seen wyrmlings are newborn dragons that have never left the nest in which they were born.
Many Dragonborn use wyrmlings in the Dro'ghat.
Young
At this point the dragon is about the size of a horse and will leave the nest a seek it's own lair.
Many Dragonborn use young dragons in the Dro'ghat.
Relationship with Dragonborn
Dragonborn mythology is that the Dragonborn are related to Dragons. This is not really true, the first Dragonborn were actually men condemned to Dragon form.
Dragons very rarely permit Dragonborn to ride them (the Dragonriders. It has been known for Dragonborn to capture and train certain species of dragon, using them in warfare both as aerial assault weapons and steads. That said, this coerced form of dragonriding seldom ends well for the rider (the dragon almost always ends up consuming their rider). For this reason riders who are not chosen by the dragon are of a lower class.