If you’re less than 40 it’s definitely not too late to start, but I should mention that there will be challenges if you’re starting fresh. If it helps, there are many people who switched careers to enter tech after 40, you can Google them. This is possible.
Tech generally doesn’t discriminate, tech doesn’t care how old you are, you just should have the zeal to learn new things at a quick pace. You must be able to keep up and willing to read, research and experiment a lot! This won’t be easy, but it’s doable, I don’t know how motivated you are.
You can start by picking what you’d like to build in your tech career. For example is it mobile apps you want to build? Web apps? Blockchain apps? You need to pick what interests you the most before you start and go all in on that. Once you know what you’d like to work with, you can start by buying and downloading some cheap/free online courses and going through those to test the waters.
From there you should practise, a lot! Build a few personal projects on your own. Have some portfolio of sorts. Get a GitHub account and dump all the things you build by yourself and through tutorials onto GitHub. You need to build a lot to get used to the tech you’re going to work on. An important reason you shouldn’t joke with building a portfolio on GitHub is because most employers would like to see what you can do, so you need to be able to have something to show off.
After this point you should start networking, both online and offline. Offline, you can join meetups or attend conferences. Online, you should get a Twitter account! Most of the tech guys are on Twitter, follow the ones that do what you want to do, observe what they talk about, learn what they do. If they post something on Twitter you don’t understand, ask them; ask a lot of questions about anything to people who started before you.
Aside networking, I’d suggest you also start your own blog and document your journey online, if you learn something new, write a blog post about it, to teach others, share your story. You know, writing what you just learned is a good way to cement it in your head while helping other newbies at the same time – win-win.
Then start applying for junior positions both locally and abroad (online).
You’ll do great!