How old are the Rocky Mountains in western Canada?

They are 50-100 million years ago

The mountains of western Canada are tall and jagged, creating magnificent scenery. They contain many minerals, dense forests, mineral resources, and potential for hydroelectric power. Banff and Jasper National Parks as well as other national parks and public lands combined with private activities, such as ski resorts, attract millions of tourists each year. As with most things in life, a price must be paid for benefits. The jagged and tall mountains inhibit transportation. Only a few roads and railways cross the mountains, so that east-west movement across Canada is limited.