Los Angeles indie-pop foursome Echosmith visited ‘The Tonight Show With Jimmy Fallon’ last night (Nov. 13) to perform their massive hit, ‘Cool Kids.’

Though the four siblings -- singer Sydney, guitarist Jamie, bassist Noah and drummer Graham Sierota -- range from only 15 to 21 years in age, they hit the stage like seasoned pros. Check out the performance in the video above.

Echosmith’s debut album, ‘Talking Dreams,’ arrived more than a year ago, but it found a later-in-life hit with ‘Cool Kids.’ The song has helped the quartet sell out a number of tour dates across the country, but you can still catch them live at performances scheduled through December.