Dear Chandrasekaran Ji,
First of all, Thanks a lot for sharing your experience. We all are depressed to some extent - that's what I have realized over the years.
Secondly, more than 80% of the depressions are curable. And in your case, it is 100% curable. You have find a way out, dismissing any pre-conceived notion about future.
Simply speaking, quit the job for a better one - the sooner the better. 'Better' here means that particular job that can free you from the state of acting like a machine.
And about the age-score relationship of test result, you wish the score was lower and I wish my age was lower.
Last but not least, the jovial reply and the willingness to share that you are depressed, suggest in no uncertain terms that you are not as depressed as the score tells. So, unearth all the possibilities and live life to the fullest.