[emersonrsantos]

Old components are still (and will be) manufactured, since so many old tech depends on it, like refrigerators, air conditioners, washing machines, microwave ovens, ...

[acherion]

Some old components will be, sure, but there are some chips that aren't manufactured anymore. There's no one blanket rule.

[hsbauauvhabzb]

I doubt it would be impossible to replace a Pentium 2 machine in most of the western world for at least the next 20 years.

[emersonrsantos]

That's true, but in many cases, it's not the integrated circuits (ICs) that fail, because they tend to be quite reliable. It's more often the capacitors, resistors, storage devices and power supply components that degrade over time. Capacitors, in particular, can fail due to heat, aging, or voltage surges, which can lead to failure in devices even if the ICs are still in good condition. Power sources can also fail due to wear on these exact components.