I started IT school at 21 after 3 years lost doing nothing. I started a bit older but also a bit more mature so I finished those 3 years easier than some. Now at 28 I am a freelance consultant enjoying my job and respected for my knowledge. 22 is definitely not too old, I’d say it’s the right time to start. Your first job will be what determines what you can become so try to find something where yiu can continue learning as much as possible

And don’t forget to enjoy it. If it you passion as well it’s an amazing job!