Bitcoin transaction priority calculation From the Bitcoin wiki page on transaction fees:


  Transaction priority is calculated as a value-weighted sum of input
  age, divided by transaction size in bytes:
  
  priority = sum(input_value_in_base_units * input_age)/size_in_bytes
  Transactions need to have a priority above 57,600,000 to avoid the
  enforced limit


Can somebody clarify what input_value_in_base_units or input_age is?
input_value_in_base_units is the number of satoshis that the input is worth. One Bitcoin is worth 100,000,000 satoshis.

input_age is how many blocks the input has been present for. An unconfirmed transaction has an age of 0, and one that has 100 confirmations has an age of 100.