I got glasses when I was 11. Started at -1.5, gradually degrading to -5.5 when I reached my twenties. But after that it stabilised, even though my job requires looking at a monitor all day. (BTW, I don't think reading from paper of screen makes much difference. Both are straining the eye. It does help if you get a good monitor, though, and provide good lighting.)
I'm 44 now, and my close-range vision is getting worse. In a couple of years I'll either need separate glasses for reading, or varifocal glasses.
To the OP: AFIAK I'm a normal case (that is, in the development of my eyesight :tilt
. Do you have a special medical condition? If not, then going blind won't happen until you're 70 or older.