Similar to last year's Windows 11, Google recently made an upward adjustment to the minimum hardware requirements for Android 13, with the intention of raising the bar. Of course, Google's prerequisite is that Android 13 devices with GMS pre-installed, in theory, if you don't plan to support GMS, then it should be feasible to go below this standard, but it is yet to be verified.
Upon checking, the last time Google adjusted the minimum hardware requirements for GMS+Android was in Android 11 in 2020, with 512MB RAM becoming the new minimum threshold at that time. And, with less than 2GB RAM, you can only run the lightweight Android Go.
However, the hardware "arms race" of Android is so fierce that recently this year's new machines are generally 4GB or 6GB RAM to jump.
So from this point of view, Google's new rules affect more of the older machines.