Some interesting tidbits when you start looking at which AS on each level should be Deferring to her equally strong sisters ... some of this doesn't really "jive" with the books, but it seems fairly clear that most women don't seem to expect an equally strong AS to defer based on years in Training or Age either, comes down to force of personality IMO.

Having an official role and how long they've been in it is clearly a bigger indicator between these women, even when it's not "official" that someone has been placed above others.

Level 13 (most senior to least senior based on training and, as necessary, age)

Elaida (goes down to being older than Moiraine and Siuan)
Moiraine (she's a year older than Siuan)
Siuan
Romanda (3 less years in training than Lelaine, but 2 more than Elaida, Moiraine and Siuan)
Lelaine

Level 14 (most senior to least senior based on training and, as necessary, age)

Bera (she's a year older than Kiruna was, but they had shortest training after Elaida/Moiraine/Siuan)
Kiruna
Martine Jenata (older than Leane, same amount of training time)
Leane
Sheriam
Liandrin
Pevara
Aisha
Valera
Sashalle
Yukiri
Galina
Merise
Saerin

Level 15 (most senior to least senior based on training and, as necessary, age)

Nesune
Carlinya
Talene
Myrelle
Morvrin (same amount of training as Desandre, but 1 less year as Accepted)
Desandre
Lemai
Anaiya (older than Katerine, but same years in Training)
Katerine
Theodrin
Silviana
Shemerin

Level 16 (most senior to least senior based on training and, as necessary, age)

Kwamesa
Beonin (older than either Aisling or Faeldrin)
Faeldrin (older than Aisling)
Aisling
Rafela
Masuri
Haesel (same total time in training as Doesine, but 4 years less as Accepted)
Doesine
Ester
Beldeine
Bernaille
Nisao (fewer years as Accepted than Adelorna)
Adelorna
Eldrith
Brendas

Level 17 (most senior to least senior based on training and, as necessary, age)

Seaine
Alviarin
Verin (older than Merana)
Merana
Teslyn (older than Joline and Erian)
Joline (older than Erian)
Erian (1 less year as Accepted than Alanna)
Alanna
Faolain
Annharid
Ispan
Meidani
Danelle
Falion
Cathal
Temaile
Janya
Seonid

Level 18 (most senior to least senior based on training and, as necessary, age)

Delana (1 less year as Accepted than Shevan)
Shevan
Saren
Corele (1 less year as Accepted than Jeaine)
Jeaine
Chesmal
Marith (1 less year as Accepted than Asne)
Asne
Kairen
Demira (1 less year as Accepted than Sierin)
Sierin
Jennet
Narenwin
Mikio

Level 19 (most senior to least senior based on training and, as necessary, age)

Celestin
Dagdara (1 less year as Accepted than Tiana)
Tiana
Gabrelle (1 less year as Accepted than Gitara)
Gitara
Berenicia
Tarna (2 less years as Accepted than Zerah)
Zerah
Sedore
Elaiva
Rubinde
Toveine

Level 20 (most senior to least senior based on training and, as necessary, age)

Samitsu
Evanellein
Faiselle

Level 21 (most senior to least senior based on training and, as necessary, age)

Valene
Tsutama
Covarla
Ferane
Rianna
Juilaine
Mayam
Jesse
Sereille

Level 22 (most senior to least senior based on training and, as necessary, age)

Vandene
Samalin
Ronelle
Sibella
Rina
Suana
Cairlyn
Ashmanaille
Merilille

Level 23 (most senior to least senior based on training and, as necessary, age)

Adeleas
Sarafelle
Takima
Escaralde
Duhara

Level 24 (most senior to least senior based on training and, as necessary, age)

Lyrelle
Lirene
Aledrin
Kumira
Andaya
Edesina
Saroiya

Level 25 (most senior to least senior based on training and, as necessary, age)

Javindhra
Moria
Velina
Zemaille
Elza
Malind

Level 26 (most senior to least senior based on training and, as necessary, age)

Varilin
Mirlene
Sareitha

Level 27 (most senior to least senior based on training and, as necessary, age)

Amico
Berylla
Salita
Aeldene
Amira (older than Janine)
Janine
Careane
Niande

Level 28 (most senior to least senior based on training and, as necessary, age)

Razina
Nelavaire
Berana
Joiya

Level 29 (most senior to least senior based on training and, as necessary, age)

Magla
Ryma

Outside of these levels there is only 1 or 2 women with Training times/ages available to figure out deference