Grouped together roughly for order of appearance, but also later interaction, we have Moiraine Damodred, Lan and Tom Merilin.

 

Description of Moiraine Damodred / Lady Moiraine of House Damodred / Aes Sedai of the Blue Ajah:

 

She has large, dark eyes and dark hair hanging in ringlets. She is barely tall enough to come up to Rand's chest. She looks the same age as Nynaeve, but with large, dark eyes that belong to a much older woman.
In New Spring, the Blue Spymistress Cetalia Delarme describes Moiraine as a “pretty porcelain doll”. Later that day, Siuan muses that "She was not a pretty little porcelain doll; she was a beautiful little porcelain doll."
She's about 5'0 to 5'2 (152 - 157 cm)

 

Full descriptions found in 3 major online sources:

 

 

http://www.encyclopaedia-wot.org/characters/m/moiraine.html:
She has large, dark eyes and dark hair hanging in ringlets. She is barely tall enough to come up to Rand's chest. A delicate gold chain fastened in her hair supports a small, sparkling blue stone in the middle of her forehead. (TEotW,Ch2) When she was young she was impetuous and hot-tempered. (NS,Ch2) She is about 5' or 5'2".

 

https://library.tarvalon.net/index.php?title=Moiraine_Damodred:
Moiraine has large, dark eyes and dark hair that hangs in ringlets. A delicate gold chain is usually fastened in her hair; on it is a small, sparkling blue stone that hangs in the middle of her forehead. She is very short, about 5 feet to 5 feet 2 inches. (TEotW, Ch. 2)

 

http://wot.wikia.com/wiki/Moiraine_Damodred:
When she arrives in Emond's Field she is described as having dark hair, hanging in ringlets. She looks the same age as Nynaeve, but with large, dark eyes that belong to a much older woman. This is the first mention of the ageless look. She is relatively short, standing at 5'2", and has a melodious voice.

 

 

 

 

Description of al'Lan Mandragoran / Lord of the Seven Towers, Lord of the Lakes, True Blade of Malkier, Defender of the Wall of First Fires, Bearer of the Sword of the Thousand Lakes,:

 

He has a face of stone and chilling blue eyes and is very tall with shoulder-length hair graying at the temples, held back by a leather headband called a hadori. Lan must be around 45 to 50 years old (born 953 NE, the books started at 998 NE and end at about 1001 NE). Pretty sure the effects of the Warder Bond would keep him looking a bit younger than his age, but I have no proof of that.
He's about 6'5 (195 cm) and muscular.

 

Full descriptions found in 3 major online sources:

 

 

http://wot.wikia.com/wiki/Lan_Mandragoran:
Lan is often described as having a face of stone and chilling blue eyes. He is very tall with shoulder-length hair graying at the temples, held back by a leather headband called a hadori.
Despite his hard features and cold eyes, Lan feels deeply and loves passionately. Women are divided on his physical attractiveness, with some finding him irresistible and others, chilling.

 

http://www.encyclopaedia-wot.org/characters/l/lan.html:
He is very tall with shoulder length hair held by a leather headband or hadori (NS,Ch1). He is tall with long hair, gray at the temples, held back from his face by a narrow leather band. His face is made from stony planes and angles, weathered but unlined despite the gray in his hair. (TEotW,Ch2) He has blue eyes and is very tall. His long hair is grayer than it used to be. (ACoS,Ch12)

 

https://library.tarvalon.net/index.php?title=Lan_Mandragoran#Appearance:
Lan is described as having an angular face made from stony planes, weathered but unlined. His eyes are cold and blue. His shoulder-length hair is gray at the temples and held back by a thin braided leather cord, the hadori. He moves like a wolf.

 

 

Description of Thomdril Merrilin:

 

Thom is an older man, with white hair and mustaches. His eyes are blue, and he is tall despite a stoop, and later a limp.
His snowy hair and long mustaches make him appear older than he probably is, given his spryness.
He is a skilled gleeman, talented in juggling, knives and eating fire.
Hight: not given exactly - just tall.

 

Full descriptions found in 3 major online sources:

 

 

http://wot.wikia.com/wiki/Thomdril_Merrilin:
He is fairly old, and has a gnarled face, shaggy white hair, and blue eyes. He is tall, with stooped shoulders.
His snowy hair and long mustaches make him appear older than he probably is, given his spryness. He is frequently portrayed as smoking a pipe.

 

http://www.encyclopaedia-wot.org/characters/t/thom.html:
He is tall but stooped with white hair and long, white mustaches. He has blue eyes.

 

https://library.tarvalon.net/index.php?title=Thom_Merrilin#Appearance:
Thom is an older man, with white hair and mustaches. His eyes are blue, and he is tall despite a stoop, and later a limp.

 

 

Descriptions of Thom are sometimes a bit conflicting, and don't always match with how spry he is (doing flips, knife-fighting, etc). It's assumed he's Andoran, but I don't recall this ever being mentioned directly? Could just be forgetting.

Source: WoT Casting - S..t just got real: Moiraine, Lan & Thom