Differentiate between young fold mountains and old fold mountains

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Differentiate between young fold mountains and old fold mountains.

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Young fold mountains Old fold mountains
They are of recent origin. They have been formed long ago.
They are higher than the old fold mountains. They are lower than the young fold mountains.
Most of the young fold mountains have pointed peaks. These mountains generally do not have pointed peaks due to erosional activities of exogenic forces. They have rounded peaks.
These have steeper slopes and deeper valleys. Due to the erosional activities of the exogenic forces, these mountains have gentle slopes.
The Himalayas, the Andes and the Rockies mountains are some examples of young fold mountains. The Aravali Range, the Appalachian and the Ural Mountains are some examples of old fold mountains.