What is 20 y 40?

"20 y 40" is the title of a popular salsa song by Grupo Niche, a Colombian salsa group. The lyrics of the song are about a man who is torn between two women - a 20-year-old and a 40-year-old. The song was released in 1999 and has since become a classic in the salsa genre. Grupo Niche has won several awards for their music, including a Latin Grammy for Best Salsa Album in 2010. "20 y 40" is just one of their many hits that have earned them a loyal following around the world.