An unanswerable question that has puzzled pundits, managers and fans alike is: what's more important, energy or experience?
Here are two teams, one with Under-21s and one with Over-33s from the Premier League. It's hard to tell whether the "oldies" would be able to cope with the energy and pace of the youngsters through sheer guile and know-how - and please let us know your views on who would win!
Goalkeeper: Damian Martinez | Arsenal
The Gunners' shot-stopper has proven fallible in the Capital One Cup.
Right-back: Phil Jones | Manchester United
Jones has performed very well for both Manchester United and England.
Centre-back: Matija Nastasic | Manchester City
Nastasic earned a name for himself in a quality first season.
Centre-back: Steven Caulker | Tottenham
Caulker gained a call-up for England after good showings for Spurs.
Left-back: Massaido Haidara | Newcastle United
Haidara's early Newcastle career has been marred by a horrendous injury.
Right-wing: Raheem Sterling | Liverpool
Sterling tore defences apart in the early months of the season for Liverpool.
Centre-midfielder: Jack Wilshere | Arsenal
Wilshere has come back even stronger after a long injury lay-off.
Centre-midfielder: Oscar | Chelsea
The Brazilian has shown why so many clubs fought hard for his signature.
Left-wing: Alex Oxlade-Chamberlain | Arsenal
Oxlade-Chamberlain has displayed remarkable consistency for a youngster.
Attacking-midfielder: Coutinho | Liverpool
Coutinho has been a bargain signing for the Reds.
Striker: Romelu Lukaku | West Brom
Since being loaned out to West Brom, Lukaku has shown Chelsea his ability.
Goalkeeper: Brad Friedel | Tottenham
Continues to perform outstandingly for a 40-year-old.
Right-back: Phil Neville | Everton
Has once again led Everton high up the Premier League table.
Centre-back: Rio Ferdinand | Manchester United
Ferdinand has been crucial to Manchester United's title-winning season.
Centre-back: Jamie Carragher | Liverpool
Set to retire at the end of the season, Carragher leaves the Liverpool supporters with great memories.
Left-back: Ian Harte | Reading
His set-piece deliveries have not been enough to keep Reading in the top flight.
Right-wing: Damien Duff | Fulham
Started the season very strongly but has faded since.
Centre-midfielder: Paul Scholes | Manchester United
After an injury-hit season, Scholes looks to be losing his touch.
Centre-midfielder: Frank Lampard | Chelsea
Despite amazing displays, Lampard still hasn't earned a new contract.
Centre-midfielder: Rory Delap
Loaned to Barnsley this season, the long-throw specialist may have played his last game for Stoke.
Left-wing: Ryan Giggs | Manchester United
Giggs continues to amaze everyone with more goals and assists.
Striker: Jason Roberts | Reading
Roberts has shown glimpses of quality this season.
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