Android does NOT slow down. The manufacturer bloatware and habits of the user slow it down. Of course, if you are still using an Android phone with 1GB RAM or lower, it will naturally be slower because most new apps and firmware are designed for slightly more modern handsets.
Why does Android get slower over time?
Operating System Updates and Heavier Apps Require More Resources. Your Android phone doesn’t have the same software it had a year ago (it shouldn’t, at least). … Or, your carrier or manufacturer may have added additional bloatware apps in an update, which run in the background and slow things down.
Do phones get slower over time?
Phones (and computers) do not slow down ever. Apps (new and older apps with updates) and operating system updates become more demanding in terms of memory and processing power requirements. This gives us the illusion that our phone has slowed down.