Who they were when they were reincarnated after being goddesses (yet got reincarnated again due to death or sudden disappearances):
Selene: Ancient Egypt – Diane
Ancient China – Serene
Silver Millennium (I'm going to say SM for short) – Princess Serenity
6 years old (What age she was) – Selenity (died in a car crash and 3 years ago met Harry)
9 years old (What age she was) – Serena (died when OZ killed her parents and 3 years ago met Heero)
12 years old (What age she was) – Diana (died in an airplane crash and 4 years ago met Kouichi)
14 years old (What age she is now) – Usagi to others
Hecate: Ancient Egypt – Hera
Ancient China – Sakura
Silver Millennium – Princess Shikari of the Dark Moon
4 ½ years old (What age she was) – Pan (went missing)
7 years old (What age she was) – Ashley (died by Malamalajong and 2 years ago met Jase)
8 ½ years old (What age she was) – Karen (died in a car crash and 2 years ago met Matt)
10 years old (What age she was) – Mary (went missing and 1 ½ years ago met Ken)
11 years old (What age she was) – Kaori (died in an airplane crash and 3 years ago met Taguya)
14 years old (What age she is now) – Angelina to others, or Pansy to most
Gaia: Ancient Egypt – Emmy
Ancient China – Raine
Silver Millennium – Princess Hikari of Earth
5 years old (What age she was) – Kishi (died in a shoot out of OZ and 2 years ago met Quatre)
6 ½ years old (What age she was) – Jesse (went missing and 2 ½ years ago met Raimundo)
8 years old (What age she was) – Himiko (died in a car crash and 3 years ago met Tai)
11 years old (What age she was) – Marron (went missing)
13 years old (What age she is now) – Ginny to others