There’s always a calculated risk when buying any used vehicle of any brand, especially one with 100k miles. The biggest factors are vehicle condition and maintenance records. If the truck was well taken care of all maintenance is properly documented, you should have little to worry about.
Ford F-Series hasn’t been the best selling vehicle in the US for 38 straight years because it’s “unreliable”, despite what some brainwashed foreign brand loyalists will tell you.
Interestingly enough, although the truck you’re looking at is 5 years older than your Taco, you’d be upgrading to rear disc brakes, power height adjustable seats, and a modern infotainment system! You’d finally be living in the 21st century!