Gene Simmons’ age appears to be catching up with him after the Kiss bass player’s bladder failed him whilst on stage.

Kiss were playing a show in Denver on Wednesday when the incident occurred.

A video that has since shown up on YouTube shows him nonchalantly raising his bass and letting rip a stream on urine before he casually steps back from the puddle he created.

A stage hand is seen attempting to sneak on stage to clean up the puddle but Gene simply waves him away.

Kiss are currently in the middle of a tour that will visit 40 cities across the US along with Def Leppard.