I would say my Sega GameGear, but I just went to turn it on, aaaaaaand it's probably well past time to replace the caps. And screen. And motherboard...

NAS, 2015. Not too old.

My Nintendo DS.
Somehow the battery is still charged and went multiple times from red state to a green state.

An Acetronic MPU1000 games console, from the 1970s - 76 or 78 I think. Still worked last time I powered it up, I also got some extra games cheap off eBay a while back, interesting playing something other than the three or four games I remember from childhood.

1901 Edison victrola. Listen to Edison's band.

Dynaco ST-70 stereo tube amp, probably from the 60s (no date on them that I can tell).

Very proud of it, got it for free at a garage sale. Replaced selenium rectifier with silicon diodes, a few new caps, and new tubes. Sounds great.

A few, a silver Pikachu Gameboy color, some synthesizers from the 1980's, a unique guitar that I've only been able to find documentation of 1 other one online (Ibanez Nitro full wood body finish - it's certainly a custom). And I think the last pride and joy is my Sony MDR-V600's.

Anybody remember Cube World? Those little electronic cubes that you could magnetically attach to others and they could interact? Got a set of those too.

The music stuff is the oldest but it's mostly second hand so it's harder to claim. The headphones were a gift and new back then though, so they're for sure, same with the Gameboy color and Cube World. Heh :)

Daily? Logitech MX-518. I'd still be using my CeBIT 2003 IntelliMouse if it hadn't been jostled by one too many trips in a backpack. Both are newer than the Max Payne mousepad that is somehow still in tolerable condition.

No, wait. I just glanced at the time on a Westclox digital alarm clock, model 22636, production code 1/10/83. That thing's older than I am. Had to check the underside again: Norcross, GA. I was unsure if "Westclox" hinted at being produced in West Germany.

Newton MessagePad 2100. I used it daily from 2008-2011 (well after I had an iPhone) for office work and everyone thought I was crazy but I loved it. I still prefer the ui for calendar/contacts/note taking compared to everything else out there.

My ps1 probably. I just played with it yesterday and I loved it.

I have a TI 99/4A PC that still works! It has a super weird version of BASIC and I don't have any tapes for it, but it's a cool display piece. I was able to make an educated guess that it was manufactured in 1982 based on the design

Probably an nes or vcr. I have an Atari too but it's not hooked up so idk if it still works. I have some old film projectors too

Probably one of my CRTs from the early 80s, unless we're counting basic stuff like my house wiring or gate speaker.

I have a Milling Machine with a 1902 patent date on it. It was converted to an electric motor, but the line shaft pulley is still on it.

Two game boy DMGs, one kept original and one modded with a new shell, membrane, and LCD screen. It's a great hobby restoring them.

I know this isn't what you meant but, this week I restored a large format photo enlarger from the 1950s. A Beseler 45 MCXR. I am extremely proud that I was not electrocuted, and I printed a 4x5 negative as a Christmas gift for my mother in law.

My N64. I probably have a few pieces of tech older than me, but I can't think of them off the top of my head.

I have a PC from 2004 as well.

a core 2 duo full tower pc from mid 2000s

first it had win95, XP, 7, now runs void Linux

the oldest is one of my portable cassette recorders, a very early GE model that is in near perfect condition. It's so early on it doesn't have much info online, and seems to be rare, but unwanted.

The one im the most proud of is my IBM LexMark model M keyboard, It's older than me, abused to hell, modified, and is still my daily driver because it's so comfortable

The CD player i found on the curb. I had no idea how old it was but i looked it up for this thread and it has user reviews from 2007.

Sony CMT Nez50

Works great, 15 volume already feels loud

An electric turkey-carving knife, made in 1962. GE built it to last.

As for daily usage and "tech" - I have a Samsung Galaxy S1. The battery still holds a charge and it's being used on a near daily basis (for very simple stuff). Runs Omnirom with android 4.

14 year old Wacom Tablet. It still gets regular use.

A 1930's Remington mechanical typewriter. My dad used it regularly until he passed away, it still works perfectly and I've got a whole box of ribbons for it.