premise: Ben Marshall (born 8 June 1990) is a retired rugby union player from Ireland. He primarily played as a lock or in the back row. Marshall played for Irish provincial sides Leinster and Connacht in the Pro12, but was forced to retire in 2017 due to a concussion injury.
hypothesis: Marshall retired from the game while in his 20s.
reason: Marshall was born in 1990 and retired from rugby in 2017, so he was 27 and thus in his 20s. The algorithm may not know math or know what 'in his 20s' means.