Just checked the guide it looks like the free license is for Manitoba residents only see some parts of the guide below. Good luck to your Grandpa show him the ropes Colin !
A “Manitoba Resident Seniors Conservation Licence” is for seniors
(65 and over) who have permanently resided in Manitoba for at least
6 months and is valid for a conservation limit of fish only. Manitoba
seniors wanting a regular limit of fish must buy a regular resident licence.
A resident is a person who has lived in Manitoba for the immediate past
six months. A Canadian resident is a person who has lived elsewhere
in Canada for the immediate past six months. Any person who has not
lived in Manitoba or Canada for the immediate past six months is a
nonresident and must purchase a nonresident licence.