If you mean "50 years later" than the dates of their original recordings, then the Dubs and Willie Winfield and the Harptones were still appearing around 2004 - 2006. Two original members of the Teenagers still appear periodically. Don't know if they're still performing today.
Great list, BTW!
Ntra la porta tua lu sangu � sparsu, E nun me mporta si ce muoru accisu... E s'iddu muoru e vaju mparadisu Si nun ce truovo a ttia, mancu ce trasu.