It appears to work fine (it contains my home partition for my main machine I daily drive) and I haven’t noticed signs of failure. Not noticeably slow either. I used to boot Windows off of it once upon a time which was incredibly slow to start up, but I haven’t noticed slowness since using it for my home partition for my personal files.
Articles online seem to suggest the life expectancy for an HDD is 5–7 years. Should I be worried? How do I know when to get a new drive?
I had an external HDD that I was using for years. Some of that time it was attached to a Server basically running 24/7 definitely dropped that thing a couple of times. That HDD has been out of use for years now but I’m sure I could just plug it in tomorrow and it would spin up fine. HDDs can last forever untill they don’t.
So Backups! And don’t worry about the rest.
Also as others said if you’re interested how long and hard it’s actually been working check out the smart data if there are any fail criteria you might wanna get a new one just to avoid restoring from Backup but if all’s green just let it keep chugging until it doesn’t and remember Backups!