Samuel L Jackson is planning to retire from action films at the end of 2006 because he no longer thinks he'll be believable shaping up to 20-year-olds on the big screen.

The PULP FICTION star will turn 58 in December (06) and he thinks that'll be time to give up action roles.

He says, "I don't know how much longer I want to be running and jumping, chasing people and shooting at them.

"I don't want to be going hand-to-hand with some 20-year-old and have people say, 'He can't fight a 20-year-old. Homeboy's got about 20 seconds of real hard fightin' in him before he's out of breath and had to rest a minute.'"