How to select from database using laravel where clause and created_at

I want to select all the data on a database using laravel db query or Eloquent ORM. So i want all the data that are other than 3 days from the day they where created. Data 'A' is created on 15th i come in on 16th to check, i won't see Data 'A' but i may see others older than 3 days or equal to 3 days. If i come back on the 18th or 19th i should see Data 'A', obviously because it now older than 3 days or equal to. so i wrote this code that is not working below

$users = DB::table('matched_users')->where( 'created_at', '>=',
 Carbon::now()->subDays(3)); 

so can anyone correct this for me.

via Ilamini Ayebatonye