Late 20s. 2 years overall, but that was interspersed with doing work in Athens. I would say maybe 1 year of travel and 1 year of working, overall.

I had spent ~10 years working in tech so I had some savings. Contract work also helped.

Not sure what the total cost was exactly, but the cycling part was cheap. It's ridiculously cheap if you're in Asia or cheaper parts of Europe (Greece, eastern Europe, etc). It got more expensive when I bought a van...