PoS (Proof of Stake) what happens to the coin age of the change after I send an amount? Ok simple scenario I have 100 'whatever' coins in a PoS wallet, they are mature and have a stake weight that is approaching the weight to stake and forge a block.
I send 1 whatever coin to my freind and get 99 back to the change address, is my stake weight consumed or maintained?

I realise using a fictional coin isnt ideal, if its treated differently in different existing coins that would be useful to know.
Their age is reset.

You're creating a transaction with two outputs: sent amount and change. AFAIU, the age for staking is calculated from the confirmation height of the transaction that created them. Since each was newly created in the transaction, the age for both is reset.