Need help, pleasee...

A Company uses the straight-line depreciation method, and reports the information below for its plant assets below:

Cost: $850,000.

Annual depreciation expense: $50,000.

Accumulated depreciation expense: $200,000.

Required:

a. Compute the analytical measures of plant age for the Company

b. What information is useful to determine an estimated point of plant asset replacement in a forecast of future cash flows?

c. Will the analytical measures of plant age impact (be included) an analyst's forecast in this case?