Who skis free: Ages 4 and younger.

Who skis at a discount: Ages 65+ pay $73 for one day; $219 for three days and $365 for five days.

Vail, which owns Beaver Creek, offers PEAKS discounted tickets if you pre-purchase online a three-day or more ticket at least seven days in advance (international guests must buy 14 days in advance). Membership in PEAKS is free and you are automatically enrolled when you make your early purchase. Vail has a handful of pricing periods, so check carefully to see what the prices are when you plan to visit. Some pricing periods look the same until you consider longer stays.

Note: These window ticket prices are valid through April 15, 2007, except very early and late seasons.

Interchangeability: All lift tickets also are valid at sister resorts Vail, Keystone and Breckenridge, as well as at nearby Arapahoe Basin.