|Young at Heart|
|Season 08, Episode 17|
|Air Date||February 16, 1999|
|Writer|| Bruce Ferber|
|Previous||Mark's Big Break|
|Next||Love's Labor Lost (Part 1)|
Young at Heart is the seventeenth episode of the eighth and final season. It originally aired on the ABC network in the United States on February 16, 1999.
The plans for Tim and Jill's 19th wedding anniversary go awry when Tim is caught on security cameras in a compromising position with his new female mechanic named Alex (Jenny McCarthy).