I have been developing software for a living for over 25 years. Primarily this has been C++ (9 years) and Java (10+ years), but all told, I know at least 15 computer languages at this point, going back all the way to dBase.

I'm still learning something new every day, either new libraries or another programming language entirely - because if you aren't learning something new every day, you definitely are not in the software industry.