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

### Instruction:
How old was the mother who delivered on December 15, 2008?

### Inputs:
table_name: table, columns: ['Congresswoman', 'State', 'Date of delivery', "Mother's age", 'Baby gender']

### Response:
SELECT Mother's age FROM table WHERE Date of delivery = december 15, 2008