REACHING the age of 60 is an important milestone in the life of a Buddhist. It is the attainment of the fifth cycle, the start of the age of wisdom, and a good reason to celebrate. But Aung San Suu Kyi of Burma, a devout Buddhist who turned 60 on Sunday, June 19, will commemorate it alone, as she has for almost 15 years of her recent past, far away from family and friends. Suu Kyi, as she is familiarly known, has been under house arrest on orders