Long sort of lasting, as you'll see...

Those "Sloop John B"/Cotton Fields"/"Shortenin' Bread" guys who admired the Kingston Trio played their first gig in 1961 (about six months before the Rolling Stones played their first gig).

The Beach Boys, licensing that name from a corporation owned by Brian Wilson, Mike Love, the estate of Carl Wilson, and Al Jardine, and including original member Mike Love and longtime Beach Boy Bruce Johnston, have upcoming concerts in multiple countries. Brian Wilson is also touring in multiple countries and his lineup includes longtime Beach Boy Jardine (e.g. lead vocal on "Help Me Rhonda") and former Beach Boy Blondie Chaplin (e.g. lead vocal on "Sail On Sailor").