premise: The Rolling Stones kicked off their latest tour on Sunday, with a flashy, high-energy concert at Boston's Fenway Park that made no concession to the band's more than four decades playing pounding rock 'n roll.
hypothesis: The Rolling Stones were formed in 1961.
reason: It's never stated explicitly and it can't be determined from the text because we don't know when the article was published. It's difficult because perhaps the system thinks the article was published this year, so it does some incorrect math.