You forget that most youngsters getting married get their receptions payed for by people (parents) our age. And that the large part of the wedding party are family members MUCH older than the bride and groom and their friends...

I have done many weddings for youngsters in that age range. You play music that suits ALL generations yourself (classic rock, ballads, some country, folk-rock, whatever) and then you spin some Mary Blige and Kanye West later on (when the old 'uns are getting pooped!).

Everyone goes home happy. Weddings, except for the most spoiled or those paying for their OWN receptions, cater to ALL ages. And you and I won't get hired in the first place if ALL they want is rap and hiphop.

Problem solved...
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An arranger is just a tool. What matters is what you build with it..!