As a businessperson, you have already established your skills as a "people person" and a "problem-solver." But to be a truly successful entrepreneur, you have to be a psychologist. And your patients are your customers.
It is your job to find out what makes each of your customers tick as a whole. You have to determine how to group your customer base by certain categories and understand how you successfully meet each group's needs. 
One common grouping of customers is by generations, which all have more or less predictable tastes.
Here are a few tips for marketing to each generation.