I’m in my house right now with a perfectly working thermostat that’s 70 years old.
And given the mechanism of action it will continue working in another 70 years.
16 years for hardware used inside of homes is a ridiculously, absurdly, short lifetime. Even for a vehicle that would be pushing the edge of “too short”.
That said 16-year-old software is not that old. If it’s built using sane language choices it should actually be functioning and modern today.