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

### Instruction:
With a previous number of 68165, what is the oldest converted date?

### Inputs:
table_name: table, columns: ['Number', 'Previous Number(s)', 'Previous Class', 'Converted', 'Withdrawn', 'Disposal']

### Response:
SELECT MAX Converted FROM table WHERE Previous Number(s) = 68165