1Route::middleware([CheckAge::class])->group(function () {
2    Route::get('/', function () {
3        //
4    });
5
6    Route::get('admin/profile', function () {
7        //
8    })->withoutMiddleware([CheckAge::class]);
9});

1Route::middleware(['first', 'second'])->group(function () {
2    Route::get('/', function () {
3        // Uses first & second Middleware
4    });
5
6    Route::get('user/profile', function () {
7        // Uses first & second Middleware
8    });
9});

1php artisan make:middleware NameOfTheMiddleware

1<?php
2
3namespace App\Http\Middleware;
4
5use Closure;
6
7class CheckAge
8{
9    /**
10     * Handle an incoming request.
11     *
12     * @param  \Illuminate\Http\Request  $request
13     * @param  \Closure  $next
14     * @return mixed
15     */
16    public function handle($request, Closure $next)
17    {
18        if ($request->age <= 200) {
19            return redirect('home');
20        }
21
22        return $next($request);
23    }
24}