Pay a mechanic you trust to evaluate it! Best money you’ll ever spend.
Also, vehicles have records of reliability. Look up the year and specific model on the ‘net.
Price sounds a tad high, but not out of line. Price would be justifiable if the owner had the service records for the vehicle, especially if the service was performed at the dealer the vehicle was purchased at or at minimum, another Honda dealer.
Honda dealers keep meticulous records on the vehicles they sell and service. If the owner were to try and trade that vehicle in to another Honda dealer and there were no dealer service records for the vechicle, they'd take a hit on the trade in value.
Honda's traded in at a Honda dealer, in which the service records indicating Honda Service had maintained the vehicle will always fetch a higher trade-in value since Honda will know the vehicle.
So ask for the service records, if it was maintained by Honda or elsewhere. If it was maintained elsewhere and parts were replaced, I can all but 100% guarantee you OEM Honda Parts weren't used on any repair.
Having said all that, Honda's are about as reliable as a vehicle as you can find. If the service records the owner has show nothing more than oil changes, inspections, and perhaps brake service or transmission service (fluid changed) don't be surprised. Honda's are that good.