Is IQ stable over life?

As a keen observer of human cognition and development, I must pose the question: Is IQ, the metric often used to gauge intelligence, truly stable throughout an individual's lifetime? Or does it fluctuate in response to various factors, such as education, environmental exposure, and even age? Is there evidence to suggest that IQ can be enhanced or diminished over time? And if so, what are the implications for how we view and measure intelligence in society?