Comment by entropy_

Mid-30s and no regrets so far after roughly 12 years of experience. I've done mobile development (Symbian, yes that Symbian, iOS and Android) backend (nodejs, erlang, PHP, python) data engineering and probably a host of other things that don't spring to mind immediately. That being said, I've mostly been working in startups (the longest being the current stint of nearly 8 years now from early employee to IPO) and generalists are generally really well appreciated in those settings.