Fiftieth birthday is an important birthday. It is a mark that someone has reach the age when he/she has done it all. Celebrating fiftieth birthday is once in a lifetime chance and gift. You should try something new to celebrate your fiftieth birthday like test driving supercars around and event learn to drive helicopter.
If you are preparing surprise fiftieth birthday for you beloved friend, make it simple, personal, creative and memorable. You can do this on their apartment and make some simple decorations. You can make scrapbook pictures from high school, graduations, wedding day, his/her first pet, and etc then you can talk about it together.
Other way is you can watch the memorable video of your birthday friend and then talk about funny things you have done when you were young. Find their favourite music playlist, so you can use it on their birthday party. You can also watch a movie together and singing together in their home.
Prepare some fine beverages for the party like champagne or wine. Prepare some dessert, sweets and another special treats for everyone to celebrate the party.