I’ve become a senior but, find the iPhone almost intuitive to use.
Although I’ve had to tweak some settings for use by me.
My mind still works easier in Windows, than iOS.
You could always just skim through the *.pdf manual for how to use your particular model of iPhone and version of iOS.
With a side of this article-
https://www.popsci.com/smartphone-settings-accessibility
Accessibility settings made my life much easier, in dealing with iPhone ‘s.
Versus slamming it across the room as I learned to type with pudgy fingers and many cuss words, on a virtual keyboard🤣.
Froze
And yes, after long days/nights, I'd still like to swing these hunks of glass , plastic and silicon against the nearest wall Come on retirement!