How often to flush fluids on a 2002 Mazda 626 LX with 100,000 miles?

What is your question?

Mechanic wants to flush brake fluid, coolant system fluid, and power steering fluid. Brake fluid flush last done in 2012, at 78,000 miles. That's 6 years and 22,000 miles ago. Coolant system fluid flush done -- no date found in records. Power steering fluid flush -- no date found in records. Is this the same as transmission fluid?

What makes this problem better or worse?

No specific problems, want to know appropriate maintenance schedule