Senderos, 22, skippered a side with an average age of less than 21.
He told Arsenal TV online: "It was strange for me to be one of the oldest.
"Eduardo was the oldest of all so we were having a laugh with him about that because normally he is one of the youngest at 24.
"But these players have played in this competition and also played in the Champions League last week.
"So we are getting stronger because we have the experience now."