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

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 24 minutes ago \| parent [-]
		Unless the thermal paste goes bad and the fans get clogged and you get thermally throttled.