In eragon murtagh turns 18 seven months before meeting eragon so, in eldest he is around 19
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In the movie Eragon Garrett Hedlund plays murtagh and he is 25.
He was 22
Yes, Murtagh was Eragon's half-brother.
Brendan Murtagh was born in 1983.
Tim Murtagh was born in 1981.
Chris Murtagh was born in 1984.
Johnny Murtagh was born in 1970.
Andy Murtagh was born in 1949.
Elaine Murtagh was born in 1940.
John Murtagh was born in 1943.
Murtagh believed he was telling the truth. Eragon and Murtagh really are half-brothers and share the same mother. The part Murtagh was incorrect about was who Eragon's father was. Murtagh's father was Morzan, whereas Brom was the father of Eragon. Eragon was not even aware of this himself until after Brom's death.
Murtagh is certainly not evil. He is just being controlled. Galbatorix has complete power over him, and keeps Murtagh as a slave.
Garrett Hedlund plays murtagh in the movie eragon.