What technology has not changed the slightest bit from when you were young?
I am .... along in some years .....
and despite the rapid pace of technological change, some areas remain totally untouched, or relatively the same.
Bic ball point pens. I love them, they haven't changed in 40+ years. Elmer's Glue bottles are still a trial to keep working, no change, either. Someone who could invent a self-closing, non-jamming glue bottle could make billions.
Pencil sharpeners. Most electrics can't handle heavy use. We recently stayed in an old resort that had a Boston hand sharpener from the 1920s that was both elegant and did a great job.
Most hand tools are exactly the same.
I have nail clippers I stole from my parents decades ago that still work perfectly. I have a radio from 1985 that I listen to every morning. It plays cassettes, too.
What are some of yours?
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I seem to still receive tons of it. Mainly bills! 
After reading through this thread, I am seeing people naming old tools and tech that they still use, not the same tools as made today in comparison to those made in their childhood. So, yes, the Slinky has changed because of advances in materials science that has allowed them to make them out of plastic and it still works like one made out of metal.
Pencils have changed technologically with the invention of the mechanical pencil, as well as the disposable mechanical pencil. Yes, you can still buy 2mm pencil leads for such holders (and the sandpaper flats to 'sharpen' them.) Go to an art supply store if there are any near you and have a look at how pen and pencil technology has changed since you knew them however many decades ago. Some are the same, while others are unrecognizable. (Watercolor-pigment pencils, anyone?) For that matter, I don't use a mouse on this desktop computer; I use a Wacom tablet with a stylus so that I can also draw and paint with specialized software 
Even books have advanced technologically. We've got eBooks now, and print-on-demand. No one offered POD forty years ago (or not without taking an order for a thousand books at a time.)
You can get nail-clippers made out of ceramic because the ceramic will never dull or rust.
And I'm not going to name something like a chef's knife or a vegetable peeler, because is it really "technology" or simply a tool?
Factories change, become more efficient, become technologically advance including with robotics.
Perhaps the better question would be what technologies have not changed drastically since their invention even with incremental changes overall. Chef knives would be a good example there. Different forging technologies, yet it's still just a knife 
Jaws of life thingy.
Terry cloth cloth towels. They've tried to improve on them, but nothing beats a 100% cotton terry cloth towel for drying off. The smooth velour type look pretty but don't dry well on the smooth side.
Zippers! Although they have the plastic kind now and invisible zippers, good old metal zippers are still the best.
for liquid absorption: medical towels
I use those in the kitchen (managed to buy about fifty of them surplus because they all have a hole in the middle for thumb surgeries.) They absorb better than any terrycloth towel I've ever used. The runner-up for the same uses in the kitchen are towels made from bamboo fibers. They're also softer than terrycloth.
In the bathroom, I do still use terrycloth, mostly because of the size needed. Plus, I've discovered that organic cotton terrycloth is superior to any other fiber, at least for the towels I bought. And I love the colors (lime green, and royal purple.) I don't think either of them are of the colored varieties of organic cotton, but it would be nice if someone made towels out of those fibers, too.
Naturally-pigmented organic cotton:
Was to find just the right place for the pencil sharpener. LOL. It's still there and still works just as well as I remember. No matter where we lived, that was something we could always depend on. 
No matter what frills, bells, and whistles we hang on a car, every time we start one up, we're using 140 year-old technology.
Looking forward to the day when Tesla takes over the world...
I might get a Chevy Bolt later this year or early next year, those are the cars with no fuel tanks and about 200 miles of range.
I've driven a Tesla Model S a couple times, if I could afford one of those I'd probably get one tomorrow.
I don't think it's changed a bit in about 100 years. I bought two identical ones, the same brand, about 20 years apart and other than one being shiny and new...they're identical.
The one that came with my food processor didn't work nearly as well.
comes to mind.
