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I used to start a stopwatch when I'd get a new phone so I could see exactly how long I had it. Can't say I ever tried to move them to a new device though
What did you do when you needed to use the stopwatch?
Also, if you use android, you can use this site https://myaccount.google.com/device-activity and pick your device, and it tells you the date it was first registered.
Stupid, but I'd just lap it. Would give me the difference and worked well enough for the rare occasion I actually needed a stopwatch.
Also the Google sign in trick only works if you're signed into Google. I used to put lineage on my old phones and now GrapheneOS. I stopped doing the stopwatch thing long ago however.
So did you just never turn your phone off?
I could use my phone like normal. It marks the start time then anytime you view it it'll display the difference. Reboots had no effect