If you're planning a party for someone who is approaching a milestone birthday year, like 40, 50, 60 or beyond, you want it to be fun and memorable. Forget the "over the hill" theme.
That can be fun when you turn 30, but loses it's humour when you get closer to the top of that hill. Instead, commemorate the year the guest of honour was born with a stylish party he or she will remember for years to come.