actually, i know a way you can change it. it doesnt always work but its worked for me a few times. Press Ctrl+Shift+C then type in testingcheatsenabled true. Then Shift+click on the sim you want to change. Make sure your on your active sim. You should get the option to edit sim in create a sim. Then click the option. You can change your lifetime wish there. I hope this works for you!
All times are (GMT -08:00) Pacific Time (US & Canada). Current time is 1:08:09 AM