How often should I replace my iPad?

Good day, I'm curious about the lifespan and replacement cycle of an iPad. As a technology enthusiast, I'm always looking to stay up-to-date with the latest gadgets, but at the same time, I want to ensure that I'm not wasting resources or money by replacing my devices too frequently. Can you provide some guidance on how often an iPad should be replaced, considering factors such as performance degradation, software support, and battery life? Additionally, are there any signs that indicate it's time for an upgrade? Thank you for your insight.