An age analysis determines how long the water has been in the system and is more of a general water quality indicator than a measurement of any specific constituent. To configure for an age analysis:

1. Click the Analysis menu and select Calculation Options.
2. In the Calculation Options manager, click the New button to create a new calculation option definition.
3. Change the Calculation Type to Age.
4. Specify the Calculation Times and the Age Tolerance. Optionally, specify Hydraulics, Adjustments, and/or Calculation Flag settings. Close the Calculation Options dialog.
5. Assuming you have not already set up an Age alternative for this scenario (including defining the trace node), go to the Alternatives tab, click the Ellipsis (...) or New button next to the Age choice list, and add or edit an Age alternative. To edit an existing alternative (see Age Alternatives), click the Edit button. Enter the appropriate data, and click Close. Rename the alternative to give it a descriptive name. To add a new alternative, click the Add button. Enter a descriptive name into the New Alternative dialog box and click OK. Enter the appropriate data into the Age Alternative Editor and click Close. Back in the Alternatives tab, choose the desired alternative from the Age Alternative choice list.
6. Click the Compute button.