Hi
You are not alone.
I'm surprised all the time how many people don't know that holding the "Control Key" and moving the mouse wheel allows you to zoom in and out in any browser, and many other applications.
It's been that way for as long as I can remember but I used computers for years, before someone pointed it out to me.
Now I use it all the time.
At 75 not everything is easy to see, sometimes the type in web pages is just too small, zoom, I can fill my 27" screen with one paragraph of copy.
It's a great aid for the aged, LOL
Mike