How do you match data stored in pivots? Laravel 5.3

Let's say I have an agency and a user and I want to match the currently logged in user against agencies on age. I might write something like this:

$agematch = Agency::where('Age', 'like', Auth::user()->Age)->get();

But let's say most information like Work_Preferences is stored in pivot tables. Both users and agencies access the same Work_Preferences information, however they each have a unique pivot table set up to link to Work_Preferences. How might I perform a match query on that?

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