A quick-thinking Braintree postal worker is being credited for alerting authorities when he noticed an ailing 67-year-old retiree on his route didn’t meet him at the door to collect his Social Security check like he usually does.“I said, ‘Something is not right here,’ ” U.S. Postal Service carrier Tom Balzano of South Weymouth told the Herald, adding that he noticed the man “didn’t look good the last time I saw him.”