HE'S DEAD!
It's not officially known. But he must have been in the least five years old going on six because a lion's mane is not fully grown until the age of five and his mane was fully grown. Judging by...
Mufasa's brother is Scar. At the beginning of The lion king Scar is visited by Mufasa and Scar says to him "Why if it isn't my big brother".
He murdered him.
I think the guy who does Darth Vader in star wars.