Nisaburo and Hiroko Ohata are unlike most Japanese couples their age. Sure, Hiroko,58, is worried about her husband' s high blood pressure, while Nisaburo,60, promises his wife that if she loses 18 pounds they' 11 take a trip abroad. What makes the Ohatas different is how they met, through a matchmaking organization for single seniors. " On the second date, he asked if I wanted to meet his family," says Hiroko. "I took that as a proposal. " A little rushed, perhaps, but 17years after his wife' s death, Nisaburo knew he' d found a new wife. The couple just celebrated four years of marital happiness last month.　　In the past, people like Nisaburo and Hiroko might have chosen to live out their lives alone. But as Japan' s society ages, attitudes about love and remarriage late in life are changing. In 2006,according to government data, three times more men and nearly five times more women in their 60sand 70s married for at least the second time, compared with 20 years befor