Well sorry to be crude, but it just signals that you're all talk. You say you're a great programmer, and could learn to program in Ruby in a few days, yet in 10 years you've never done it, even though you are apparently applying for jobs that are interested in that skill.
If you can't even bother with learning the language that's requested in the advert in a few days, why should a hiring manager be interested in you?
I'm also in my late twenties, and have been programming for money for over 10 years and I also like to brag about how I'm a great programmer and am fluent in over a dozen programming languages, but you bet that if I'd go for a job that requests Node.JS experience (I wouldn't), I'd brush up on my Node.JS and make sure my resume lists it as a core competency. You can't just go around saying you're a great programmer and expect people to believe it from ten years of Java experience.
If you can't even bother with learning the language that's requested in the advert in a few days, why should a hiring manager be interested in you?
I'm also in my late twenties, and have been programming for money for over 10 years and I also like to brag about how I'm a great programmer and am fluent in over a dozen programming languages, but you bet that if I'd go for a job that requests Node.JS experience (I wouldn't), I'd brush up on my Node.JS and make sure my resume lists it as a core competency. You can't just go around saying you're a great programmer and expect people to believe it from ten years of Java experience.