He told The Mirror: "He has been playing fantastic like always. He's our captain and he's been really, really important for us.
"When you get older, you lose something physically and when he was playing with Fernando Torres, he was more behind the striker, making runs. Now he plays deeper, keeps more of the ball and works differently.
"But the quality of the passes and the crosses he produces, and the free-kicks, at 50 years of age, he will still be doing the same thing! He will always have that and his quality is amazing."
Liverpool moved second in the Premier League table with Saturday's success against Fulham, closing the gap on leaders Arsenal to two points.