It depends on how your view is set up. If it's simply a list of customers, placing min(Date) on the text shelf will allow you to easily see the earliest date for each customer. Another option would be to use the window min function. A gantt chart could be created or something similar that uses a formula similar to the following and placing it on the color shelf:
if min([Order Date])=window_min(min([Order Date])) then 'show' else 'hide' end
Hope this helps a bit!