Johnny Mathis earned the honorific "the Voice of Romance" for a reason. For more than 60 years, he’s applied his classic croon — warm, rich and velvety — to a succession of love songs and slow jams.

Music legend Johnny Mathis has called it quits on his glittering career ahead of his 90th birthday — citing his advanced age and trouble with his memory — and a source exclusively tells Closer he’s ...