Tsunami

Characters: Korra, Mako, Bolin, Caloway (OC), Iroh, Asami, Tenzin, Ikki, Jenora, Meelo, Pema, Rohan, Lin Beifong.

Summary: The characters are telling their story after experiencing a natural disaster of water during a vacation.

Character ages during tsunami

Korra: 21

Mako: 22

Bolin: 20

Caloway: 19

Iroh: 25

Asami: 22

Tenzin: 55

Ikki: 11

Jinora: 14

Meelo: 9

Pema: 39

Rohan: 4

Lin Beifong: 54

I'm only unsure about Iroh's age because his avatar wiki page just says young adult under his age. But, it's pretty explanatory that it's 4 years after the whole Amon thing.

Character ages during story telling

Korra: 25

Mako: 26

Bolin: 24

Caloway: 23

Iroh: 29

Asami: 26

Tenzin: 59 (would be, but died during)

Ikki: 15

Jinora: 18

Meelo: 13

Pema: 43 (would be, died of heartbreak after a year without Tenzin)

Rohan: 8

Lin Beifong: 58 (would be, but died of natural causes 3 years later)