Javascript – AngularJS and NodeJS required version

I am new to the world of Javascript and their frameworks, and I feel a bit lost with this. I am trying to follow the official toutorial of AngularJS. In one of the first sections, it reads

Install Node.js If you want to run the preconfigured local web-server
and the test tools then you will also need Node.js v0.10.27+.

You can download a Node.js installer for your operating system from
http://nodejs.org/download/.

The doubt is: why have I to use NodeJS 0.10.27? it's a old version, given that now (as I've just seen in the NodeJS's website) the project is on the version 4./5.

If I am saying things that aren't, please correct me.

EDIT:

I tried to follow the steps of the tutorial with the 4.* version and I'couldnt due to the required NodeJS version of the dependencies.