premise: Ralph Edward Tresvant Sr. (born May 16, 1968), also known as Rizz and Rizzo, is an American contemporary R&B singer best known as the lead singer of R&B/pop group New Edition. As a solo artist, Tresvant released the album "Ralph Tresvant" (1990). In 2008, he began touring with Bobby Brown and Johnny Gill in a new group named Heads of State.
hypothesis: Tresvant turned 40 in the same year he began performing with Heads of State.
reason: Tresvant was born in 1968 and began touring with the group in 2008. 2008 - 1968 = 40.