Bravo! It's true, in Kenya we lack a system that safeguards the elderly. This initiative could empower them so that they can be self reliant individuals. You could train them on many other skills too and could help export their items eventually.
This would be great for rural areas and slum areas where getting clean water is a problem. this they can make themselves with minimal requirements and get access to clean water. Great idea!
We have a related idea, to go beyond what the Kenyan education system. I also believe experience is the best teacher and I support your idea.
Read about mobile classrooms and let me know what you think.