How old do Sylesties have to be before they become adults?

@Yukihime,

Pet Aging and Maturity
Maturity is measured in hours and comes in four categories: Eggling, Hatchling, Adolescent, and Adult.

It takes roughly 72 hours (3 Days) for a newborn Eggling to become a Hatchling.
It then takes roughly an additional 144 hours (6 Days) for a Hatchling to become an Adolescent.
It then takes an additional 18 Days for an Adolescent to become an Adult.

Profile Views and Nurture Clicks can speed up the growth of Egglings and Hatchlings. Egglings and Hatchlings cannot take part in exploring of any kind and must stay in your Hatchery until they are an Adolescent.

When an Eggling reaches 72 Incubation (The Green Bar on their Profile Page), it will be Ready to Hatch. You can either choose to Help It Hatch, Let it Hatch, or use a Philter. All three choices will permanently increase its stats. Which stats and how much depend on your choice. Also, if you wait too long, the Eggling will just hatch on its own and you will miss this opportunity.

As far as Breeding, only Adult pets can breed. However, once a pet is an Adolescent, they are fully capable of exploring.

@Yukihime,

Depending when you got them, the number of days you have to wait is different~ :3

When you breed pets and get an egg, eggs take 3 days to hatch and turn to hatchling, that take 6 days to mature into Adolescent(which means a total of 9 days, but if they get nurtured lots, the time for waiting is shortened depending on how much they were nurtured)

Starting from Adolescence, it takes 18 days to become Adult

If you caught Adolescents in the wild, they might become Adult sooner, but give them at least 18 days to be sure, if they age before, it's just great for you

The only difference from Adults and Adols are that the Adults can breed, otherwise, it's pretty much the same~ :3
Plus, pets never get too old

Enjoy Sylestia!
If you got more questions, don't be shy, Sylestians will always like to help anyone out
(That's the joy of being here! )

So never be shy to post a question, none are dumb questions, it's normal to be confused with so much greatness around

­@Faiona,

I got Ninja'd XD

@Yukihime,

Moved to FAQ Forums.

Okay, thanks for the answer.