Welcome to Health Care Magic
There is no specific treatment of proved value.
Some are due to Alzheimer - drugs are given routinely by neurologists / but the improvement is questionable ...
Some are due to atherosclerosis
- aggressive cholesterol
reduction may retard / low dose aspirin
may prevent clot formation
Like any other organ, more it is used, less will be the atrophy
or degeneration / solving puzzles, reading and so on may help...
Wishing speedy recovery