Is it critical to change coolant at 100K?

[RMcG]

I have a Yaris Hatchback, base model that has just turned past 100K. It is almost 11 years old. I was just looking at the maintenance schedule and the schedule says the engine coolant should be changed at 10 years or 100,000 miles.

I have to take an emergency road trip of about 1300 miles round trip (all interstate driving) in a couple of days.

Is it critical to change the engine coolant before I go on the road trip?

Would I be taking a big chance if I did not have the coolant changed until after I get back?

Thanks,

R.