Will the Stonehenge last forever

Answer 1

No. Not in it's current state (it's eroding all the time) and then in perhaps 5-6 Bn years time, roughly when the sun expires anyway, it seems that all matter may be accreted to the galaxies active nucleus (AGN), broken down and re-ionized. Nothing lasts 'forever' in any static state.

It will, however, last a long time. It's a historic piece of ancient civilization, and is protected by the British government. It was built approximately 5,000 years ago.

Answer 2

Stonehenge is estimated to have stood for over 4,000 years, but it is hard to predict how long it will last as erosion and other factors continue to affect it. With ongoing conservation efforts, it is possible that Stonehenge could exist for many more centuries.