Guardian Dragons reach their Teenage stage at the age of 125 years old, they begin to practice their heartsongs and try it out with the opposite genders of the dragons, trying to find different rhythms and tones to work off of to build their songs up to their full potential, they begin to search for a mate by the age of 185 years old, however finding the perfect song could take them up until they are 230 years old, beyond that point most females/males are taken and they lose their chance of finding a partner to spend the rest of their lives with.
Some of those who are unable to find a mate cannot be with others who don't have mates as their heartsongs may not synchronise and they'd have to wait for the next generation of males/females to find a partner, once a teen becomes and adult at the age of 200 they find it slightly harder to find a mate. However if a Guardian Dragon does not find a mate by the age of 230 their colours begin to go back to a saturated/gray colour. If their mate/partner dies later on in life their colours can become dull (but not saturated) and they'd have to go on for the rest of their life without a mate.

Teenagers soon begin to get an understanding as to what their own physical talent may be, flying, strength, speed, intellect, firepower, hunting or fighting. No matter what their differences they are all accepted, very few Guardian dragons have ratios of these talents.

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Whoo, done another one, look at how cool they look!
Just to say that I didn't add colours to this one as they are the same as those in the previous ref sheet. Enjoy!