Jamie Redknapp and his ex-wife Louise have marked a major milestone as their eldest son Charley has flown the nest.MORE: Jamie Redknapp and wife Frida dote on baby Raphael during Italian holidayCharley, 18, has enrolled at the University of Arizona in a bid to pursue a career in sports after some encouragement from his loved ones.WATCH: Jamie Redknapp teases son in sweet golfing videoTaking to Instagram on Wednesday, Jamie shared a series of snaps with his eldest son in the States. He wrote: "So a new chapter begins for you at @uarizona Charley.