How long will a computer tower last?

Good day, fellow tech enthusiasts! I'm curious about the longevity of a computer tower. I understand that hardware ages over time and performance may decline, but I'm wondering if there's a general rule of thumb for how long one can expect a tower to last before needing significant upgrades or replacement. Factors like usage, maintenance, and the quality of the components surely play a role, but I'm looking for a ballpark estimate. Is there a sweet spot where a tower is still functional yet approaching the end of its lifespan? Your insights would be greatly appreciated!