I'm in my mid 50's. I started wearing glasses at 8 years old due to "lazy eye". I made it to 44 before I was forced to wear bifocals.
My dad had trouble with progressive bifocals, and I heard a lot of people having problems with them. Since I did a lot of work using
a computer screen (volunteer 911 operator for over a dozen years) and personal use of a computer, I went with the standard "line"
bifocals. Now, in my mid 50's, what works the best for me is I went to the expense of getting a mechanical swing arm, to mount the
monitor. When I'm working with the computer, I keep the monitor around 12-14" away from my face and don't have to do the up down
neck thing. Plus, to keep me from being "tunnel vision" focused on one spot, I move the monitor arm a few inches every so often to
force my eyes to focus for a different focal length. For me anyway, I find the occurrence of headaches after a prolonged time, a lot
less.