That is: If you haven’t spoken to the people on your guest list within the last five years, they probably shouldn’t be on your guest list!
You can also use the five-minute rule too. If you can’t picture yourself wanting to spend five whole minutes with the person in question on your wedding day (which absolutely flies by!), then they should probably be left off the guest list.
One group that can also take up considerable space on your guest list are coworkers. To avoid any sticky situations, you can choose to not invite anyone, or keep it to a minimum of coworkers you consider friends.