I think that yes, when you’re older you had more time to draw and practice and you have more experience (you have seen more so you know better how to draw it) but it’s also a lot about practice. I started to draw realistic about 4 years ago and I was very bad :( so I often drew and I have improved a lot but I’m still learning. Also I have improved a lot since I started to draw on this app and when I tried to draw for the first time (on this app) I thought I would try 1 or 2 drawings and delete it because it's difficult to draw here but I got over it! :)