Is it critical to change coolant at 100K?

[RMcG]

Thanks to everybody. I don't have a garage, just the parking lot of the apartment I live in. I am inclined to do this myself if it is realistic for me to do this. The cheapest I can find anybody to do it for me at a garage is about $150 (USD). And I think it would be more if it requires flushing, rather than just replacement.

Is this something I can do myself pretty easily?

I was looking at some videos and they were talking about burping the system and other stuff which seemed complex. In addition, the maintenance schedule says it should be changed at 120 months (ten years) and the car is almost 11 years old. So I am thinking that maybe the age is factor in addition to the mileage of 100K.

I just went out and checked the coolant (engine cold). The coolant appears pink and clear, no rust or particulates. And it is about 1 inch above the "LOW" line on the plastic overflow tank.

Any other comments would be appreciated.

Thanks,

R.