One Direction is currently making fangirls scream and become fiercely protective of their favorite British boys. Many teenage girls think their passion can't be understood by the older generation. However, boy bands then and now still get the same reaction from fans.

The 1990's also known as the boy band-era saw quite a number of groups of good-looking crooners basking in their fans' love. Even after a decade, these avid followers still buy new albums and go to concerts even with their families in tow.

The most influential boy bands worldwide included the Backstreet Boys, N'Sync, 98 Degrees, New Kids On The Block, Westlife, Boyzone, and Boyz II Men.

They were trendsetters in music and fashion, selling out thousands of records even without the help of the internet, as well as successfully endorsing products.

Some are even making a comeback—O-Town just released a new single and album while Take That is planning for a Christmas 2014 comeback.

Browse through the gallery to see how boy bands look then and now.