The Hornets striker has praised the form of 35-year-old goalkeeper Heurelho Gomes
The Brazilian stopper made several crucial saves as Quique Sanchez Flores' side as the Hornets drew 0-0 with Bournemouth at Vicarage Road to extend the club's unbeaten run to three matches in all competitions.
The 35-year-old stopper was renowned for enduring runs of poor form and making high-profile errors during his days at Tottenham, but has enjoyed a resurgence late in his career at Watford.
After a man-of-the-match display against the Cherries, Deeney hailed Gomes' performances throughout the season and insists that he only keeps improving with age.
The striker told the Evening Standard: "For a goalkeeper to have only one bad game in two years, that shows the high level of application he has been putting in.
"He is a bit like a fine wine, getting better with age. I thought he was simply excellent again against Bournemouth."
Gomes joined Watford initially on a single-year contract in 2014 after falling down the pecking order at Spurs, and immediately became a key player for the club, featuring 44 times as the Hornets won promotion to the Premier League last season.
His impressive form has seen him hold on to his number one spot at the club this season, despite the signing of Sunderland stopper Costel Pantilimon in the January transfer window.
He has not missed a single Premier League game for Flores' side this season, keeping 11 clean sheets in 27 matches.