The evidence for the age of the Sphinx is not only that it is aligned with Leo rising for 10,500 BC, but also that the erosion on the body of the Sphinx can only be attributed to rainfall, which did not occur in the region much after 10,500 BC.
Proxima Centauri (from Latin, meaning nearest [star] of Centaurus) is a red dwarf, a small low-mass star, about 4.25 light-years from the Sun in the constellation of Centaurus.
The next nearest star to us is Proxima Centauri, at a distance of roughly 4.4 light years, or about 9,460 billion Km. Traveling at 100 Km per hour, it would take about 10.8 million years to cover that distance.