The discussions above somewhat becomes misleading. Its good to see dev answered it already. To support the clarification made by dev above, here is a good example from him to made more things clearer.

Let's explain this with a simple example:

Bob has only one ETH address and he received 4 transactions in total:

1.Received 10 PoSToken and held it for 91 days. 91 days is greater than the Max Coinage(90 days), so we use 90 days to calculate coinage: 10*90 = 900 token-days
2.Received 20 PoSToken and held it for 90 days. Coinage: 20*90  = 1800 token-days
3.Received 30 PoSToken and held it for 3 days. Coinage: 30*3 = 90 token-days.
4.Received 40 PoSToken and held it for 2 days. 2 days is less than the Min Coinage(3 days), so the coinage of these 40 PoSToken is zero.

During these days, Bob hasn't spent his token. Then we say that Bob has accumulated 1900+800+90 = 2790 token-days of CoinAge and if Bob start pos mining right now, he will get 2790*1/365 = 7.64 POS.

Reference post: #629
As it was asked by me as it is somehow related on what I am thinking ( coin age reset) when new tokens added to a non triggered one.