Closer to every 5-6 years these days and with ram prices going up it will be even longer. Especially with the low/mid range phones, which are most phones outside some developed countries, people will keep their phones as long as they can.
Would depend on the income levels, but yeah, buying a new phone these days is entirely a non essential luxury. An iphone easily lasts 7 years so the moment money is tight, it's a very easy choice to not buy a new one.
I mean are there even any reasons to buy a new phone?
If I compare the Pixel 6 Pro I'm using at the moment to current models, they are functionally identical. The only reason to upgrade might be getting a fresh battery and access to firmware updates.
Otherwise I'd be happy to continue using it for the next 10 years.
