Thiago Silva may be 37 years old now, but often it is rather hard to tell.
Week after week Silva puts in commanding shows of marshalling Chelsea's back line, helping them to become European champions last season and, until last week, top the Premier League table.
A fine example of his strengths came in their recent 4-0 home victory over Italian royalty Juventus. Silva bullied opposition strikers and read the game majestically, before capping off his performance with a showreel-perfect clearance off the line to deny Alvaro Morata a goal on his return to Stamford Bridge.