People are using them or they wouldn't be making them.
With the 6/6+ it seems that the holster may be the way to go to avoid bending and have easy accessibility
Medium. Fits the iPhone 6 with the apple leather case. It's lined with super-soft fake fur material. It will sit horizontal or veritcal on your belt. The outer zipper holds lots of credit cards, plus a short pen (just in case).
I like it because it fits more than a traditional belt case, because it can be velcro'd to a shoulder bag, it fits as many cards as I need (maybe 5) without distorting the case.
When it zips shut, it's a little tight around the corner, but mine loosened up.
I turned 50 last May, so theory's about age can remain intact. ;-)