I’ll check it out. The 2 external drives I have are about 8-10 years.
I have two Samsung HDDs connected via USB 3 that reside in OWC Mercury Elite Pro enclosures. Both drives are over 10 years old. For years now I only turn them on when I perform a backup or need to access archived data. A few days ago I ran Disk Utility and checked the drives; both passed.
On the other hand, a SamsungT3 256GB SSD I got in June 2017 failed a Disk Utility check. I was doing a Time Machine backup of my wife's MBA when the backup stalled due to an issue. Disk First Aid is unable to remedy the problem.
For the first three years of its life with us I used it as an external boot drive for my 2012 Mac Mini. When I started using my current Mini 2 1/2 years ago I switched it to become a TM drive. It isn't connected 24/7; in fact, the last backup was months ago. (Backblaze does the 24/7 backups.) Admittedly saw a lot of use as a boot volume and at only $100 I considered it money well-spent since I didn't care to open up the Mini to install one internally.
This is the second Samsung 850EVO SSD that has failed. I installed the other one in a 2011 13" MBP and it lasted 3 years before it died without warning. That's when we got the MBA.
The externals are essentially identical particularly the archive volumes. So one is a backup of the other. I also have other backups so until I have reason to do so, I'll be keeping the decade-old drives in my lineup.