The age limit for being on your parents' health insurance varies depending on the insurance provider and the specific plan. However, the Affordable Care Act (ACA) allows young adults to stay on their parents' health insurance until they turn 26. This applies to all individual and employer-sponsored plans, including those offered through the Health Insurance Marketplace. It's important to check the details of your specific insurance plan to confirm the age limit and any other requirements for dependent coverage. Keep in mind that once you reach the age limit, you may need to find alternative health insurance coverage through your own employer or through other means, such as purchasing an individual plan through the Marketplace.