"There are no limits to learning," is the author's motto. Of course, with advanced age physical restrictions have to be accepted. But an immense choice of challenges is still within reach - just stretch out your hand. Bruna Moehl belongs to the group of people who like to explore the opportunities of a senior's life. Out of the blue she did 'Delta Gliding' in the Swiss Alps to celebrate her 60th birthday. "It was a strange feeling, gliding over the snow-covered pines with skis on my feet," she explained. For her 70th, she went skydiving in DeLand. "The sensation to be a part of the univer