Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What age group has a time of 6:37.73 at the 200m breaststroke?

### Inputs:
table_name: table, columns: ['Pool', 'Age Group', 'Time', 'Event', 'Date']

### Response:
SELECT Age Group FROM table WHERE Event = 200m breaststroke AND Time = 6:37.73