Since there's no proper Author's Notes in this site yet, I'll use this blog instead.
I was really wanting for an A.N. so I could put the ages of the characters, in comparison in human years, but meh...
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Characters
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* these are their ages when they first appeared in their respective chapter...
* compared to human years (since I have no idea how pony ages work)...
* also, I am assuming that the Mane 6's ages in the first season are in between 19 to 22...

Main Characters...
Henry Hoof
- a brown-eyed changeling, disguised as a dark-green alicorn pony, with a dark-brown mane and tail.
- has a brown-covered opened book, with blank white pages as his cutie mark.
- currently living in PonyVille, working as the town's librarian and the author of the Daring Do book series.
- 28 years old

Ember
- a yellow earth pony with a dark-blue mane and tail.
- lives in Ember Town in Fillydephia.
- has a half-heart with flames as her cutie mark.
- first appeared in Chapter 1.
- 21 years old

Flame
- a pale-red earth pony with a mane, much darker i color than his coat.
- lives in Ember Town in Fillydelphia, a farmer of his family's grapefruits.
- has a half-heart with flames as his cutie mark.
- first appeared in Chapter 1.
- 23 years old

Aurora
- an orange pegasus with a grayish-white mane and tail.
- currently living with her mother, Sunset, in PonyVille.
- has an aurora as her cutie mark.
- first appeared in Chapter 3.
- 12 years old

Midnight
- a dark-blue unicorn with black mane and tail.
- currently living in PonyVille, working as the town's mailpony.
- first appeared in Chapter 4.
- acquired his piano key cutie mark in Chapter 17.
- 17 years old

Daybreak
- a golden-brown unicorn with sky-blue mane and tail.
- currently living in PonyVille, working as the town hall's accountant.
- has three numbers as his cutie mark.
- first appeared in Chapter 4.
- 17 years old

Pearl
- a blue fish-tailed seapony with long black mane.
- has a white pearl as her cutie mark.
- first appeared in Chapter 6.
- 22 years old

Rose
- a yellow earth pony with dark-brown mane and tail.
- lives in Manehattan, and is the president of The Rose Industries.
- has a judge's hammer as her cutie mark.
- first appeared in Chapter 4. introduced herself in Chapter 8.
- 25 years old

Cloth
- a green-eyed changeling, disguised as a black pegasus pony with green mane and tail.
- wandering around Equestria, but currently resting in White Tail Village.
- first appeared in Chapter 18.
- 37 years old.

Blue Sky
- a blue pegasus pony with white short mane and tail.
- lives in White Tail Village.
- haven't acquired his cutie mark yet.
- first appeared in Chapter 19.
- 15 years old.

Other (O.C.) Characters...
Coal
- a red earth pony with an orange mane and tail.
- lives in Ember Town in Fillydelphia.
- haven't acquired his cutie mark yet.
- first appeared in Chapter 1.
- 9 years old

Golden Time
- a pale-yellow unicorn with black mane and tail.
- haven't acquired his cutie mark yet.
- first appeared in Chapter 7. introduced himself in Chapter 10.
- 7 years old

Sunset
- a dark-orange pegasus mare with red mane and tail.
- lives in PonyVille.
- has a sun behind a hill as a cutie mark.
- first appeared in Chapter 3.

Griselda
- a griffin, living in Talon Valley.
- first appeared in Chapter 5.
- 21 years old

Griever
- a griffin, living in Talon Valley.
- first appeared in Chapter 5.
- 23 years old

Helios
- A red-feathered griffin, living in Talon Valley.
- first appeared in Chapter 5.
- 49 years old.

Snow Flake
- a white unicorn pony with black mane and tail.
- currently staying in PonyVille.
- has a snow flake with a musical note as her cutie mark.
- first appeared in Chapter 10.
- 16 years old

Melody
- a blind brown earth pony with black mane and tail.
- currently living with her father in Canterlot, a professional violinist.
- has a violin as her cutie mark.
- first appeared in Chapter 12.
- 18 years old

Doctor Magnifico Psycho
- an old black earth pony with a messy white mane and tail.
- a genius scientist in Canterlot.
- has a cutie mark of two hands of the clock.
- first appeared in Chapter 3.
- 63 years old

Sonic Wave
- a massive white pegasus stallion with black mane and tail.
- became a flight teacher in Ponyville.
- has a blue crescent wave slicing through a cloud as his cutie mark.
- first appeared in Chapter 7.
- 41 years old.

Whirlpool
- a bulky blue-green seahorse-tailed seapony oricorn, with crystal-blue mane.
- richest and busy businesspony in Coral Edge, a massive city of seaponies.
- has a whirlpool as his cutie mark.
- first appeared in Chapter 7.
- 56 years old.

Sand Stone
- a dark-orange earth colt with lighter orange-colored mane and tail.
- lives in White Tail Village.
- haven't acquired his cutie mark yet.
- first appeared in Chapter 19.
- 16 years old.

Ash Shore
- a dark-grey earth colt with light-brown mane and tail.
- lives in White Tail Village.
- haven't acquired his cutie mark yet.
- first appeared in Chapter 19.
- 16 years old.

Earth Current / a.k.a Easy
- a bluish-green earth colt with dark-blue mane and tail.
- lives in White Tail Village.
- haven't acquired his cutie mark yet.
- first appeared in Chapter 19.
- 17 years old.

Dandelion / a.k.a Dandy
- a pale-orange earth filly with dark-red mane and tail.
- lives in White Tail Village.
- haven't acquired his cutie mark yet.
- first appeared in Chapter 19.
- 17 years old.

Gentle Leaf
- a mute, pale-green earth filly with black mane and tail.
- lives in White Tail Village.
- haven't acquired his cutie mark yet.
- first appeared in Chapter 19.
- 15 years old.

Boulder Break
- a gray earth pony with yellow mane and tail.
- has a broken rock as his cutie mark.
- first appeared in Chapter 21.
- 9 years old

Time Keeper
- a brown alicorn with long black mane and tail.
- has an hourglass in front of a starry background as his cutie mark.
- first appeared in Chapter 7.
- the alicorn of time.

Space Border
- a pale-blue alicorn with long black mane and tail.
- has a vertical white line in the center of a starry background as his cutie mark.
- first appeared in Chapter 7.
- the alicorn of space.

Other (Canon) Characters...
Big Macintosh - 22 years old
Cheerilee - 19 years old
Ditzy - 19 years old
The Mane 6 - around 7 to 10 years old
Shining Armor - 19 years old
Spitfire - 13 years old
Zecora - 18 years old
Princess Celestia
Princess Cadence
Queen Chrysalis

I'll be editing this when a few more characters appear in the fanfic. =/