Looks like a good start. Squats looked pretty good to my untrained, non coach eye, so take that with a grain of salt. I'd keep an eye on depth as the weights go up, make sure you don't start cutting any depth...looked just right at parallel to me.
I'd invest in some lifting shoes, a belt, and a good set of knee sleeves. Running shoes will get mighty squishy as you add weight to the bar. Belt will help you lift more weight and, imo, help protect and stabilize your spine. This was an important consideration for me as I started training at a similar age(43) 3 years ago. You are squatting more than me when I started!