No. Basically I want a site / service that can connects specifically elderly people with people trying to learn English. Actually don't have to be open source, neither free. I expressed bad myself, sorry.
There's plenty of technical solutions already, you may just want a little glue with good ux design, fast internet, and good support staff, especially for the elderly.
In this example, someone setup a relationship between a retirement home and an English learning school. Outside of that, it would probably turn into a chatroulete.