500 years
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The planets in our Solar System have existed pretty much as long as the Solar System - about 4.6 billion years. Planets in other, older, solar systems may have existed quite a bit longer - almost as long as the Universe (which is 13.8 billion years old).
All constellations are a long long way away from our Solar System.
a long, long away it takes a satalite 23600 years just to get through the whole solar system!
It has been suggested that comets originate in the Oort cloud and then travel in long elliptical orbits around the Sun.
There are no known stars on a collision course with the Sun. The closest star to our solar system, Proxima Centauri, is still over 4 light-years away. Any potential star encounters with the Sun would be on incredibly long timescales.