Mickey Marner
Registered User
In Leafs 100 history Joe Thornton is the oldest Leaf player to ever dress for a game and record a point.
Oldest skater. Johnny Bower recorded an assist on his 43rd birthday!
Johnny Bower 1967-68 Scoring Log | Hockey-Reference.com
Edit. It also appears Allan Stanley, who scored the goal Bower assisted on, was also older than Thornton. Bizzare coincidence.