Laravel 5如何在中间件中获取路由参数？ 有大用

Route::get('test/age/{age}',[  

    'middleware' => 'old',  

    'uses'=>'Test@test'  

]);  

protected $routeMiddleware = [  

        'auth' => \App\Http\Middleware\Authenticate::class,  

        'auth.basic' => \Illuminate\Auth\Middleware\AuthenticateWithBasicAuth::class,  

        'can' => \Illuminate\Foundation\Http\Middleware\Authorize::class,  

        'guest' => \App\Http\Middleware\RedirectIfAuthenticated::class,  

        'throttle' => \Illuminate\Routing\Middleware\ThrottleRequests::class,  

        'old'=>\App\Http\Middleware\OldMiddleware::class //增加  

    ];  

public function handle($request, Closure $next)  

    {  

        //$age = $request->route('age');  

        $age = $request->age;//两者均可  

        if($age<=200)  

        {  

            echo '<=200';  

            die();  

        }  

        return $next($request);  

    }  

public function test($age)  

    {  

       echo $age;  

    }