James Robert McDermott celebrated his 100th birthday on March 20 singing along to the sounds of World War II-era showtunes and Irish music at Stockstill House, his home since 2006. The centenarian, originally from New York, served as a marine before moving on to build planes in Dallas. He retired to Petaluma, near his adopted niece Felicity Kirsch, who used to live in Point Reyes Station.    David Briggs