And bingo is an easy game for groups that is most often played by elderly people at community centers or retirement homes.

It means dressing like a senior citizen. The walker that the speaker mentions is something like this: http://www.geriatriccaremanagement.com/wp-content/uploads/2009/12/rollator-walker-image-no-lady2.jpg (ie. it helps an elderly person walk).

A walker in this context is a mobility aid for the infirm. Bingo is played in retirement communities, so the phrase is comparing the subject to the stereotypical elderly