I'm 50 and learned to touch type years before there were personal computers. I switched to Colemak a couple of years ago and it took a year to get really proficient.

I can no longer type in Querty, though I have no trouble using swipe keyboards on phones. I'm a faster typer now.

But the real benefit is that it no longer hurts to type. Typing in Querty hurt my hands after a while to the point where I couldn't type or use a mouse. Typing in Colemak fixed that, even though most of my work is on my non-ergonomic Macbook keyboard.