How to enlarge fonts systemwide and in all apps?

Settings, Display & Brightness. View (at the bottom), Zoomed

I'm 70 and seem to be able to contribute to this forum several hours a day in my iphone 12 without problem.

Go to Settings>Accessibility>Display & Text Size>Larger Text. You can either turn on Larger Accessibility Sizes, or you can move the slider at the bottom of the page all the way to the right to get the larger sized text.

Okay, so it's the phone. That's part of what we've been trying to determine. As suggested, this may be a problem with your particular phone. Have you had anyone look it over?

As far as how the fonts are enlarged, you'll have to ask Apple about their design decisions. Complaining here won't change anything.

I’m 60 years old with bad eyesight and I can see my iPhone 13 screen/fonts/icons perfectly after having my eyes checked and wearing prescription glasses. I would suggest making an appointment to have your eyes checked.

Reading glasses will solve all of your problems.

I'll be turning 65 soon and with simple, cheap reading glasses, I have no trouble viewing the text on my iPhone 6s at the standard font size. I just ordered the new SE and will be using it the same way.

Cursor? On an iPhone? What in the world are you talking about?

Have you ever typed on a computer or phone of any brand?

Uh, yes. Since the days of dumb terminals at high school in the 1970's.

That's the cursor.

That's not a cursor. It's an insertion point. A cursor is what you move around on the screen with your mouse, trackball or trackpad. As a person in IT, you should know this.

Then perhaps your iPhone 13 Pro Max screen is faulty and needs to be replaced. I have been using iPhones since 2012, avoiding the larger screen iPhones, and I have never had any problem reading the fonts or seeing the icons. I am typing this on my iPhone SE 2020, 4.7 inch display, and have no problems at all, you shouldn’t be having this problem on a Pro Max size screen.

I've never had any trouble using my iPhone 6s, as long as I have my reading glasses on. Nothing to do with the phone's clarity, I just can't focus close up anymore (20/15 vision from about 2 feet out and further). So zooming wouldn't help. The screen would still be out of focus without the cheaters.

As someone who claims experience since dumb terminals you should know that the more commonly used term for decades and especially in the year 2022 is cursor.

Claims experience? Pretty clairvoyant of you to apparently know more about my high school days than I do. That terminal didn't even have a monitor. You called a mainframe, waited for a tone, then hung the phone up on rubber cups so it could talk your terminal. Everything after that, all incoming text and what you typed was text printed on continuous feed paper.

The insertion point was called a cursor back in the days of DOS, when the only marker of where you were to begin typing was the flashing underscore.

But terms change. With the advent of the GUI, the cursor came to refer to the mouse arrow. To avoid confusion as to what you were talking about, the blinking I-bar for text was changed to insertion point.

Remember when journalists (who you'd expect actually studied English) properly used affect and effect? And now instead use impact as a replacement for those, despite there being no actual impact between physical objects in regard to what they're reporting?

LoL....instead of offering anything constructive you took the time to argue about cursor vs insertion point knowing full well what they mean.

And yet, you called my response wrong, despite knowing the difference. Hmmmm.

And yes, I did offer constructive criticism. I suggested reading glasses. I didn't used to need them, either. But age changes things. The natural lenses in our eyes aren't as supple anymore, and can't be pulled/pushed to the necessary shape to brings things into focus. It's either that, or as suggested, you have a bad screen. Bring the phone into an Apple Store and have then look it over. Or, compare yours to an identical model someone else you know may have.

Sorry Kurt Lang, my response was meant for the OP lol