Q.Why My Landscape Pine Trees After 15 Years Dried?
My pines variety are pinus eldarica and pinus mogo.

Certified GKH Gardening Expert
It is hard to say without more information. The issues probably started a year or more ago. Has there been drought in the last couple of years? Here are some articles about pine problems that may help:
https://www.gardeningknowhow.com/ornamental/trees/pine/pine-tree-drying-bottom.htm
https://www.gardeningknowhow.com/ornamental/trees/pine/pine-tree-browning.htm
https://www.gardeningknowhow.com/ornamental/trees/pine/pine-gall-rust-disease.htm
https://www.gardeningknowhow.com/ornamental/trees/pine/diplodia-pine-tip-blight.htm