使用数据库和碳中的日期获取具有特定年龄的用户

I am doing requests when I want to get users with specific age. But I do not know how to get users from database. For example if user has 19 yo, I want users from age 12 - I get that user. If he has 20 - not. Can you help me with my code? Because it doesn't work.

Here's my code:

 if ($request->has('age_from')) 
        {
            $user = User::with('user_data')->whereHas('user_data', function($query) use ($request) { 
                $birth_date = Carbon::now()->subYears($request->age_from)->toDateString();

                return $query->where('date_of_birth', '>=', $birth_date); 
            })->get();
        }

You shouldn't need to format the Carbon object, Laravel and Carbon work seamlessly in database queries:

$user = User::with('user_data')->whereHas('user_data', function($query) use ($request) { 
    $query->where('date_of_birth', '>=', Carbon::now()->subYears($request->age_from)); 
})->get();