A study determined that an average 20 dash year dash old male in 2005 could expect to live at least 55.05 more years and an average 20 dash year dash old female in 2005 could expect to live at least 59.03 more years. ​

(a) To what age can an average 20 dash year dash old male expect to​ live? ​
(b) To what age can an average 20 dash year dash old female expect to​ live? ​