Liverpool manager Jurgen Klopp praised his defence and said his back four planned to stay at the Premier League club for a long time.
Led by Virgil van Dijk, Liverpool have conceded just 19 goals in 32 league games this season, putting them in title contention.
Van Dijk, 27, Andy Robertson, 25, Trent Alexander-Arnold, 20, and Joel Matip, 27, have played the majority of Premier League games for Liverpool, while Joe Gomez is only 21.
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The age profile of his back four pleases Klopp, who hopes his defenders remain at Anfield.