Ball joint maintenance?

I have a 1998 Chrysler Cirrus with 75,000 miles. I had new tires put on and asked the mechanic to check pass side ball joint. I saw the boot was cracked and you could see the ball. He thought both ball joints were good and not a concern at this time.

The ball joint and control arm are one unit and about $450 to replace. Any way to lessen wear and tear caused by the torn/cracked boot?

Background-Two little old ladies (my Mom and Aunt) put 45,000 miles on it between 1998 and 2019. I put 30K on in the last year. It's in great shape and has been well maintained.

Thank you
Author: Cirrus98