Cuso International arranges hundreds of volunteering opportunities for skilled Canadians each year in Latin America, the Caribbean, Africa and Asia.  About a third of the people they send abroad are retired or near retirement.  Erin Bateman, manager of recruitment, describes the kind of people they are looking for and how to apply:

Going on a Cuso International mission can be a very rewarding experience for the right volunteer.

Anne and Andy Joyce describe how volunteering in Namibia affected them:

A few years ago, I interviewed Doreen Spence who described her experience volunteering with in Africa:

Erin recommends checking the Cuso International volunteer placements page to see if there are any opportunities which fit your profile, and apply using the forms available on their site.  Even if you don’t find something that fits, you can send Cuso an application to keep on file in case a suitable opportunity opens up.

CUSO has produced videos to describe their programs: https://www.youtube.com/watch?v=2ghS73boQoQ