[datadrivenangel]

Have you ever owned an older phone or older computer in general? Whether hardware or software caused, they get slower.

[msh]

Only if the software gets slower. My 2015 MacBook Air is slow with the latest supported macOS but runs Linux super snappy for the same tasks.

[protonbob]

Unless the thermal paste goes bad and the fans get clogged and you get thermally throttled.