u/kilgurin

I have 132k miles on my mazda6 and haven't had transmission fluid changed(yes I know I'm stupid).I haven't noticed any issues with shifting but am starting to worry about it. Ive seen so much conflicting information, is there any truth to not changing it at a certain point and am I at that point? Or should I change it and if so the Mazda dealership near me suggested a flush which I've also seen mixed info on whether or not that's good or bad vs the drain and fill twice.