I have not recieved an answer and I did not have a health question.
I am sorry that you have not received an answer to your question:
For some reason this question ended up in the health section.
As one of the mentors on the site, I have asked to have this question moved to the GENERAL category.
Unfortunately, there is no centralized list of people who are reaching "retirement age" or a list of people who are planning on retiring.
There are dozens of companies that sell mailing lists, some of which are able to give you lists targeted by any number of criteria including age, sex, occupation etc. These lists (and their services) are not public, and you would have to purchase such a list from one of these companies.
Social Security and other government agencies do not provide such personal information to the public.