Currently, the ability to download a Customer Contact list that includes a creation date is not available. However, you can download it and yes, you can run a VLOOKUP. Let me guide you in downloading the report.
First, let's filter the list to show only the Customer that has an Active Status. Here's how:
Go to the Reports menu.
Choose the Customer Center.
Hover to the List menu.
Click the Green Arrow to open the Customer Contact List.
Select the Customize Report button.
From the Display section, mark Active Status.
Click the Ok button.
Now, you can export it.
Hover to the Excel drop-down arrow. .
Pick Create New Worksheet.
From the Send Report to Excel window, mark Create a new Worksheet in a new workbook.