Simplify the following text for a Grade 9 native English-speaking person.
Original: Kleppen , from BÃ , Telemark , celebrated his 100th birthday in March 2007 and , having participated in the 1928 Winter Olympics , was Norway 's oldest living Olympian .
Simplified: Kleppen , from BÃ i Telemark , became 100 years old in March 2007 and , having been part of the 1928 Winter Olympics , was Norway 's oldest living Olympian .