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

### Instruction:
What is the average age as of February 1, 2014 for the supercentenarians born in the United States?

### Inputs:
table_name: table, columns: ['Name', 'Birth date', 'Age as of 1 February 2014', 'Province or Country of birth', 'Province of residence']

### Response:
SELECT Age as of 1 February 2014 FROM table WHERE Province or Country of birth = united states