Singapore's population is ageing fast, but to live well past 100 years old still seems to be an extraordinary feat of nature. CNA TODAY meets one spunky centenarian and her elderly children. Some 30 minutes into our interview, Madam Lin Geok I got impatient. The 105-year-old asked her 82-year-old daughter Cynthia Low why it was taking so long. The CNA TODAY crew was standing between her and her absolute favourite activity – playing mahjong.  Mdm Lin had arrived bright and early at the THK (Thye