Millennials vs. Gen X Final Four

Clues

1. 1.The castaway who finished 2nd and Hannah Shapiro are 9 years apart in age.
2. 2.The 24-year-old is either the castaway who finished 3rd or Ken McNickle.
3. 3.The 25-year-old is either Adam Klein or the castaway who finished 2nd.
4. 4.Hannah Shapiro is 18 years younger than David Wright.
5. 5.Adam Klein finished ahead of the 42-year-old.