When a former child stars is running wild as adults and ended up living under abusive conservatorship. When they have been isolated from people they are close to. They have to ask permission for anything they want to do, like getting married, having a baby or having a phone or an Internet access.
When some resigns or retires from a job, they are on "eternity leave". This can also refer to someone who has passed away, especially someone who worked somewhere for a long time, retired/resigned, then passed away later.
Oh I'm sorry, you didn't know that Kelly is on eternity leave? She resigned and moved to Hawaii!
With regrets I would like to inform you that my boss is officially on eternity leave. I will never see or hear them again. Ever.