Manchester United boss Sir Alex Ferguson feels Chelsea pair John Terry and Frank Lampard still have years left in their legs - so long as they take care of themselves.
After all, last season he claimed a record 19th title thanks to a squad bulging with experience.
"You can only approach the identification of players when they get older from their abilities on the pitch," he said.
"Ryan Giggs keeps surprising everyone. He scored on Wednesday night, 17 years after he scored his first goal in Europe.
"You can retain your hunger. There are other good examples with Paul Scholes last season, Gary Neville kept coming back even with all his injuries. Edwin van der Sar was fantastic despite being almost 41.
"By looking after yourself and having the will to do it, you can have a long career.
"But all the evidence is on the field. There is no other way to assess it."
