Just click on the Facebook or Twitter buttons below to post a link back to this page, or share this collage Adult milestone birthday party ideas. I think this is a great idea for any age birthday and ties in nicely with the idea of celebrating the person rather than just their age. They come in 5 different sizes, but for a backdrop you probably want the large or extra large shown below. For example, you could recreate this Kate Spade inspired backdrop, below left, by using this striped tapestry available herewith paper flowers available here added around the edges. Adult milestone birthday party ideas it comes to 60th birthdays, you should definitely avoid poking fun at the guest of honours age.