By Gregg WendorfAdvance News JournalPHARR — When the phone rang at the Advance News office in late July to announce that Serda’s Barber Shop was celebrating 75 years in business Aug. 2, the first thought was, say it ain’t so. Wasn’t it just yesterday that we were there helping the shop celebrate its 50th anniversary?No, it wasn’t yesterday. Actually, that would have been back in 1998.Whoa. How fast 25 years can fly by. “Tell me about it,” said Javier Serda, son of the late, great Gabriel Serda, who along with his wife, Coleta Segovia, founded the shop at 132 E.