Age of Mount Everest in 2011: Not Specified in Context

Mount Everest's Geological Age vs. 2011

The provided context does not state Mount Everest's age. However, geologically:

• Himalayan orogeny began: ~50–55 million years ago (India–Eurasia collision).
• Everest's rock: Summit limestone (Qomolangma Formation) = Ordovician (~470 Ma), but uplifted recently.
• Modern elevation: Mostly achieved in last 10–15 Myr; still rising ~4 mm/yr.

In 2011, Everest was ~50 million years into its mountain-building phase, with its current summit rocks ~470 million years old. The 2011 measurement (8,848 m) was later updated to 8,848.86 m (2020).