SAN FRANCISCO — A 64-year-old software engineer rejected for a job at Google Inc. is suing the company for age discrimination.

Plaintiffs lawyers with Kotchen & Low in Washington, D.C., claim Google systematically excluded middle-aged and older workers from jobs for which they were well qualified. The lawyers seek to represent a class of job applicants 40 and older who were rejected by Google from August 2010 through the present.