Zachary Taylor would be the logical choice for this sobriquet.
No one else but Zachary Taylor would likely be called Old Zack or Old Zach.
Zachary Taylor
Zack Greinke is 27 years old (birthdate: October 21, 1983).
There is no husband mentioned, only an old boyfriend called Zack Fair.
He was 17.
Zack Ward is 41 years old (birthdate: August 31, 1970).
Zack Stortini is 25 years old (birthdate: September 11, 1985).
Zack Duke is 28 years old (birthdate: April 19, 1983).
Etta
there is no character called zack
As of the end of the 2013-2014 NFL season Zack Bowman is 29 years old.
US director Zack Snyder is 52 years old (birthdate: March 1, 1966).