PoW miners gather tx fees from transactions as a reward because their work is more energy intensive, PoS miners destroy tx fees - create deflation and make the remaining coins more rare and valuable. People mine 42 to take part in this process and protect their investments.
The input is mature and ready to generate the block when the CoinDay is ≥ 1. You can calculate it. For example, the input size 0.04 will be ready to generate the block in 1/0.04=25 days, 0.02 - in 1/0.02=50 days, 0.01 - in 1/0.01=100 days, etc. Minimum stake age is 42 hours, maximum age is not limited.
Also,
{
"nout" : 2,
"hash" : "000005cbefc94bfc6851d95fea7f87ee58498ffc64e9973719cc1f19b433df23",
"time" : "2017-02-25 00:02:44 UTC"
},
{
"nout" : 2,
"hash" : "00000c7e8ecc4c94ed9933601ce559071571f3dc8dea8c74136eb74bbcd1e0d3",
"time" : "2017-03-17 11:47:12 UTC"
}
]
How to set up the desirable split threshold of inputs, see here.