Law / Retirees immigration regulations in Poland [34]

The reasons on the basis of which one can obtain a residency in Poland are stated in art. 53.1 and 53a.1 of the Polish Act on Foreigners (Ustawa o cudzoziemcach) which can be found here ...udsc.gov.pl/Ustawy,182.html (first link). In the act there is nothing about retirement as a basis itself, but you could try to persuate the office (urząd wojewódzki) by quarelling that retirement is "other reasons" from art. 53a.1.4

It is very different with EU citizines who, to stay in poland longer than 3 months, just need to prove that they have health insurance and enough money (they just need to have more than 500 zł per month :o)

Law / Retirees immigration regulations in Poland [34]

To my knowledge Polish law does not establish retiring as a legitimate reason for requesting residency. But there is another way you could try: if the person has got family in Poland, he could try "family union", "connection with family" (pl "połączenie z rodziną").