With all due respect, to what age would you expect to be working? Or, put it another way, if you are talking of sailing for a few years, when you come back and are looking for a job, you are going to be pushing 70. If you didn't go sailing, what work would you be doing then anyway?
Elsewhere on this site there is a thread about annual live-aboard budgets (link here: http://www.cruisersforum.com/forums/...dget-4296.html
On that thread, you can see that about 15% of cruisers who voted are living on an annual budget of $10,000 or less per year and almost 40% on $20,000 or less per year.
Essentially, what I think you can draw from that poll
is that you can live-aboard on practially any budget....