how old are the adult TLK characters in human years?

[Nitro]

That's what I just said. Besides, when they're older, Kiara is still looking around 14 or 15, and Kovu seems to be maybe 17 or 18.

[SummerSnowLeopard]

Yeah. Maybe Simba was 21 when Nala found him, and Nala maybe 20?

[Nitro]

They seemed to me maybe 19. Either way, they were very young and foolish. After all, look how young they had their first cub (the one at the end of the movie who's identity is unknown)

[SummerSnowLeopard]

Yeah. And maybe Nuka was 15 and Vitani was 9?

[Thegeni99]

and then Kovu was seven

[SummerSnowLeopard]

Yeah. And maybe Zira was 45?

[Nitro]

She seemed to be in her early 40's or late 30's when they were cubs, and Nuka was maybe about 14 and then 17 when he died. And Vitani seemed maybe 11 or 12.

[Thegeni99]

yup, most probably, I think she was around 40 when we first see her

[SummerSnowLeopard]

Or maybe Nuka was 18 when he died and Zira maybe 53 when she died?

[Nitro]

Well Zira was old when she fell into the water, as she couldn't hold her own weight like she could before, meaning her muscles were beginning to deteriorate.