The Elder will have a yellow exclamation point above their head and reward you with a Coin of Ancestry and 75 rep with all your factions cities.

1. Elder Bladeleaf in Dolanaar: Bladeleaf is a Night Elf located in Dolanaar, Teldrassil. The coordinates are 57,60.
2. Elder Bladesing in Cenarion Hold: Bladesing is a Night Elf located in Cenarion Hold, Silithus near the Moonwell.
3. Elder Bloodhoof in Bloodhoof Village: Bloodhoof is a Tauren located in Mulgore, just North of Bloodhoof village (near the bridge!).
4. Elder Brightspear in Winterspring: Brightspear is a Night Elf located in Winterspring at 55,43. She's on the Eastern coast of the lake near Everlook.
5. Elder Dreamseer in Gadgetzan: Dreamseer is a Tauren located in Gadgetzan, Tanaris.
6. Elder Grimtotem in Feralas: Grimtotem is a Tauren located near Camp Mojache, Feralas - Coordinates are 77,38.
7. Elder High Mountain in Camp Taurajo: High Mountain is a Tauren located in Camp Taurajo, Barrens. He's right across from the Flight Master.
8. Elder Mistwalker in Dire Maul: Mistwalker is a Tauren located near Dire Maul, Feralas at 62,31 in the Arena.
9. Elder Moonwarden in The Crossroads: Moonwarden is a Night Elf located at The Crossroads near the Flight Master. Coordinates are 51,30.
10. Elder Morningdew in Mirage Raceway: Morningdew is a Night Elf located in the Shimmering Flats which is part of Thousand Needles. She's at the Mirage Raceway - coordinates are 79,77.
11. Elder Nightwind in Felwood: Nightwind is a Night Elf located in Felwood. His coordinates are 37,53, North of Jaedenar.
12. Elder Primestone in Silithus: Primestone is a Dwarf located in Silithus. His coordinates are 23,12 in the Crystal Vale. The location is to the most Northwestern corner of your map!
13. Elder Ragetotem in Tanaris: Ragetotem is a Tauren located at Uldum in Tanaris. Her coordinates are 36,80.
14. Elder Riversong in Astranaar: Riversong is a Night Elf located in Astranaar, Ashenvale.
15. Elder Runetotem in Razor Hill: Runetotem is a Tauren located in Razhore Hill, Durotar. Her coordinates are 53,44.
16. Elder Skygleam in Azshara: Skygleam is a Night Elf located in Azshara at 72,85. For those without coordinates, he's at the Southern most part of the Eastern coast.
17. Elder Skyseer in Freewind Post: Skyseer is a Tauren located at Freewind Post, Thousand Needles. Coordinates are 45,50.
18. Elder Starweave in Auberdine: Starweave is a Night Elf located in Lor'Danel.
19. Elder Stonespire in Everlook: Stonespire is a Tauren located in Everlook, Winterspring. Coordinates are 62,37.
20. Elder Thunderhorn in Un'Goro: Thunderhorn is a Tauren located at 50,76 in Un'Goro Crater.
21. Elder Windtotem in Ratchet: Windtotem is a Tauren located in Ratchet, Barrens. She's on the hill behind the bank.