Java Servlet Lifecycle and GET Request Handling:

Describe the lifecycle of a Java servlet, including the roles of HttpServletRequest and HttpServletResponse. Provide a code example of a servlet that handles a POST request by accepting user information $($name and age$)$ from a form and responds with a personalized message such as "Hello, $[$name$],$ you are $[$age$]$ years old." Include necessary annotations or web.xml configurations.