Cubs oldest, youngest debuts by position players By JohnW53 on Apr 5, 2021, 6:07am CDT + Do you remember Al Heist? He played center field for the Cubs in 1960 and 1961. In 150 games, he batted .260/.338/.390. He hit 8 home runs in 555 plate appearances, including a walk-off grand slam against the Braves on April 15, 1961. That was his second career homer. His first had come Sept. 9, 1960, at St. Louis, in his 26th game as a Cub. He played 15 before the season ended, for a total of 41. Heist was 32 years, 286 days old when he made his Major League debut in a 6-0 loss at St. Louis on July 17, 1960, 2 days after the Braves traded him to the Cubs for Earl Averill and $30,000 to $35,000.