For sport lovers, birthday cake decorations related to sports, or cakes in the shape of a sport field or any sport equipment is a good idea.
You can make a 3-4 tiered cake, with the special moments of the person's life written or drawn on each layer. You can even make use of decorative eatable items for cake decoration. You can use candles and arrange them in the shape of the number 50.
These birthday cake decorating ideas will help you to make a tempting treat for the person turning fifty. A party, along with a creative cake, can definitely help you make the birthday truly memorable for your loved one. Good luck!