There's still some rules for items to be considered :
- It has to be technology related. People can come up and say that books never get old, or the Bible, or human behaviour, or whathever. This is all true but not technology related so it's outside of this scope.
- It has to be normal to use the item today. Sure we can use a 30-year old game console, ride a 60 year old car, or even ride a 100+ year old tramway, and they still do the job. However it does feel retro and you notice a significant difference in their usage as opposed to their modern counterparts. Ideally you wouldn't realize how old the item.
- The item could have changed a little bit in design or having been improved, but overall if you took a time machine and saw this item in the past you should not be surprised.
- Electric power lines. Most of them were built between the 1930s and the 1950s, and they are absolutely unchanged. Sure, some newer lines have higher voltage than before, with taller pylons and more conductor cables per line. Also more lines are put underground, but that's about all. Modern aerial lines and pylons look exactly the same as lines built 80 years ago. And 80 year old lines are still used daily, without anyone finding this weird or retro. People might not even realize the current they use daily to charge their "antique" 5-year-old smartphone is transported through a 80 year old high-voltage line and supported by 80-year old pylons.
- Bikes. Sure, they got disk brakes and other new fancy stuff, but often this is optional. You can use a 50-year old bike and, assuming you replaced the parts that needed replacement, it'll still work great today, and - as opposed to 50-year old car - nobody will immediately notice how old the bike is.
- Skilifts and aerial lifts. Over the last 70 years, only some minor design changes have been performed, and the speed and safety has improved, but that's about it. Sure the cables have to be changed regularly but the design never changes. When going to a ski resort you can use a 60 year old skilift without even realizing how old this item is. The ski themselves however evolved a lot.
- Musical instruments. OK this might be controversial whether they're "technology" or not, but they certainly never become obsolete, nor have they much changed in the last century. The fact tube amps are still used by guitarists says a lot. If the support for recording music have changed drastically, the instrument themselves haven't changed much.