Which of the following individuals would qualify for a full or partial Old Age Security...

Lenny would qualify for a partial OAS pension, because he meets the following criteria:

•He is 65 years old or older.

•He is a Canadian citizen or a legal resident at the time of his OAS pension application.

•He has resided in Canada for at least 10 years since the age of 18.

The amount of his partial OAS pension would be proportional to the number of years he has lived in Canada after the age of 18, divided by 40. For example, if he has lived in Canada for 15 years, he would receive 15/40 or 37.5% of the full OAS pension1

References = web search results from search_web(query="Old Age Security pension eligibility")