That only apply to newly mined coins. Those coins are not newly generated so this doesn't apply. Any input that is not newly mined with 1 confirmation is considered to be matured. The main factor is the priority, it must be higher than 57,600,000 to have a high chance of confirmation. The formula for calculating priority is
priority = sum(input_value_in_base_units * input_age)/size_in_bytes
Where input age is coin age, 1BTC left untouched for one day has a coin age of 1hum... this seems wrong!!!!
i read the link posted by FSB..
https://en.bitcoin.it/wiki/Transaction_feesit seem who imput_age are the confirmation number..
and so,
if we have 1 btc coin with 144 confirm (144 is the expected number of blocks per day) the result is:
10000000 * 144 / 500(tx size in byte) = 2880000.