There are many 80th birthday invitation ideas online at various websites that allow you to print invitations for free. You simply need to determine the overall theme of your party and find an invitation that goes along with that theme. You should be able to find styles and designs for every party theme imaginable. Whether you are having an elegant dinner party or a barbeque, there are hundreds of birthday invitations ideas from which you can choose. Simply find a site that has samples of invitation designs or find a website that allows you to design your own invitations. Once you have chosen your preferred design, you can then print the invitations straight from your home or office computer printer. There are hundreds of websites that have free invitation templates from which you can choose. Remember to include any specific information about your party or celebration before you print the invitations if the site allows. If not, you can simply print the invitations and hire a calligrapher to write in the specific information or simply write it on the invitations yourself. Choosing the design should be simple once you have taken a look at various samples.