Joan Thomlinson has only one wish for her 99th birthday: to help sick children.

By the end of May, the Cambridge, Ont., woman will have taken 99 laps around the walking track at her retirement community. She started walking at the beginning of the month and plans to walk the last few remaining laps on May 30. The last day of the fundraiser is May 31.

She's hoping her feat will help raise at least $3,099 for the Ronald McDonald House Charities, a non-profit that provides families with a place to s…