"The work you did a year or more ago couldn’t possibly still be relevant today."

Are you 16 years old?

Tech changes quickly, but not that quickly. A GitHub repository with older projects would be useful to show depth and variety of experience. Just because it's not all using the latest Rails 4.1 doesn't mean that it won't show insight into professional skills like, say, well organized code, playing well with others - not to mention a longer-term outlook that isn't just chasing the latest shiny thing.