Martinez admits he is amazed at the dedication which keeps the Premier League veteran in such top condition.
"Nobody works harder than him every day," he said. "Age really is just a number for him.
"It doesn't reflect where he is. Sylvain will play as long as he wants to.
"The way he maintains himself you cannot believe. You bang your head against a wall to try and understand how he can train and perform in the manner he does with his years.
"When you try to explain to the younger players that they need to look after their bodies, Sylvain is the example.
"He has great experience and the reality is he knows how to use it."
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