Any actor has double in the fights. You just have to understand that Steven almost 60 and he can not jump as young. Look at the final duel in the movie Machete. In the duel were doubles and Danny Trejo and Steven Seagal. When attacked by Seagal, the defending double Trejo. When attacked Danny Trejo, the defending double Seagal.
That's OK, because any damage to the shooting at that age is dangerous. Stallone on the filming of The Expendables in a fight with Steve Austin, was neck injury and there are now a plate. So think about whether such a risk at that age.
P.S. Sorry for my clumsy English