Sven Hostrup Hansell (23 October 1934 6 March 2014) was an American musicologist and Professor Emeritus of Musicology at the University of Iowa. He was a specialist in the music and performance practices of the 17th and 18th centuries, as well as a harpsichordist and composer.
Sven Hostrup Hansell was alive when the Berlin Wall fell.
A: Yes

Keith Konrad Slettedahl (born August 9, 1973) is an American musician. He is the singer and songwriter for Los Angeles pop rock group The 88. In 2006, he appeared in the episode "Best Prom Ever" on the sitcom "How I Met Your Mother", playing a gig with his band on a High School-Prom.
Keith Konrad Slettedahl is now 46.
A: Yes

The Opera Company of Boston was an American opera company located in Boston, Massachusetts, that was active from the late 1950s through the 1980s. The company was founded by American conductor Sarah Caldwell in 1958 under the name Boston Opera Group.
The Boston Opera Group was active for over 25 years.
A:
Yes