Instead of the traditional "Over the Hill" birthday party, host a fabulous gathering with a decade theme or "antique person" theme. For a fun twist, hold an "imitation" party, and have all guests dress as the guest of honor.
Decade themed parties are fun and can be geared towards the honoree's date of birth or the decade he or she "came of age." Ask guests to dress in decade appropriate clothing: mini-skirts, bell-bottoms and peace signs for the 60's, leisure suits and disco gear for the 70's and big hair, pastel suit jackets and leg warmers for the 80's. Many of these clothing items and decorations can be found at thrift stores.
Host an "antique person" party, using antiques and "antique-looking" items from thrift stores and flea markets. Use calico tablecloths, any quilts you have on hand and wildflowers for decorations.
To host an "imitation" party, have all guests come as the honoree, and write wonderful or funny things about him or her on a banner or in a keepsake book. Read these out loud to the group.
Move the furniture to create a dance floor. Stream music of your choice using a free online music service such as Last FM, Rdio, Slacker Radio or iheartradio. Less chairs and more open space also allows guests to mingle easily.
Decorations can be made or purchased at a discount at flea markets or thrift stores. Search discount sections at party stores for birthday party plates, cups and napkins. Send out free custom digital invitations using a party planning site such as evite.