I tried to word my post to make the point that titles are inconsistent to the point of being random, especially across organizations. Using years of experience as a proxy for seniority always brings up the argument that years of experience and seniority are not the same thing, especially on HN. I agree with this to some extent, but as long as you aren't stagnant as a developer (which might not be entirely your fault) you will gain wisdom that people with less experience lack. That might not make up for a younger persons ability to crunch, or hunger, which could lead to gains in productivity, but I'd argue that people that stagnate later in their career probably weren't great at what they did to begin with.