Millions of years
'''A couple millions years.'''
Unknown, but one theory is appx 240m years. There is much that is still not understood about the mysterious geode.
Uluru rock consists of lithified eroded rock particles that date from the late Pre-Cambrian to Early Cambrian, over 500,000,000 years in age.
Depends on when a group of stars coalesce together it then becomes a galaxy and not a cluster. Generally millions of years