The age of Bert and Ernie is regularly discussed on forums. Nothing official has ever been said, but most consider the duo adults, as they do not appear to be highly dependent on others. Helping suggestions of the characters being young is a comment by Sesame Street Live performer Taylor Morgan. Morgan said to the Macon Telegraph that "I just kind of try to think like a 6-year-old or 7-year-old, because that's how old Bert is.

en.wikipedia

beim gugeln auch noch gefunden: bert hat heute geburtstag [ein schöner zufall].