What Accounting Treatment for depreciation if any Fixed asset finished its estimated useful life but is still in use with perfectly running condition?

Normally as per accounting standards. assets are to be valued at least of the (carrying value or Net Realisable value ei Market Value). if the assets is still in a good condition and working though the useful life of the assets has passed, assets needs to be revalued as per market value and whatever appreciation it gets should be be kept as revaluation reserve.