1: no, there have been cadets in their 30's go through the course
2: yep, zero aviation experience required, however a trial introductory at a minimum flight shows that you're keen.
3: phase 2 is the type rating, paid for by the company no debt to yourself
4: All cadets that have successfully completed the course are now employed as either first or second officers
5: Not necessarily, it depends on when they need you to start. Some are lucky and get to do their type rating straight away. Others have had to wait, up to 12-18 months