1. I suppose you are usin' 4/4.5. It becomes one at age 9, 10, or maybe even 11 (I forgot, sorry).
2.It doesn't die at a certain year, but as time comes, it will die.
3.It retires, it doesn't get that job.
4.Yes, they do retire. When you go select the JOB from the Heart icon, it'll show you...