How old was Nala at the end of the lion king?

You mean the first movie?
I think she was around... 5-6?
I have read somewhere that Simba spent about 5 years away from Pride Rock (because it takes 5 years for a lion to develop a full mane).
And i guess Simba wasnt even 1 year old when he went away, and Nala must be the same age as him.
So 5 years or a little bit older, around 6, after all at the end they have a cub. Which means some time must have passed.
Well, others can have different opinions though.

She's probably around 4 years but 21 in human years.
She's pretty much 4-5 years, while she gave birth to Kiara.

Nala was 4.5 at the end. Like Simba