Young, who turns 36 next month, completed a free move to Villa where he played for four years before leaving to join Manchester United a decade ago.
Villa manager Dean Smith spoke after the game about his unhappiness that speculation about an injury to Grealish had spilled out before the game.
City moved above Leicester to the top of the league, although Manchester United can reclaim first place by beating Fulham later Wednesday.
Four of Villa's starting line-up weren't even born when Liverpool midfielder James Milner made his professional debut for Leeds in 2002.
Villa reported 'a large number' of players and staff returned positive tests following routine testing on Monday.
Cesar Azpilicueta said Chelsea is disappointed over being unable to secure all three points from the game against Aston Villa.
The Magpies were due to head for Villa Park on Friday, but were granted permission to reschedule the fixture.
Lewis Grabban's first-half header was good enough to give the Birmingham club victory at Villa Park as Leeds suffered their 10th defeat of 2018.