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@ 74,000 miles if the fluid is still fairly clear, you are probably ok.
However, in a high mileage tranny with really dirty fluid it's only the crap & varnish stopping it slipping. Highly detergent fluid or flush will do a great job cleaning it out, but very often the trany will start slipping soon after.
The company I work for has over 4,000 vehicles (light truck)with auto, we now only change the fluid at 60,000 kms (to keep the warranty boys happy) then not again.
A US company with a similar size fleet (all cars) did a study over several years and found it cheaper not to do a fluid change ever and just pay for the odd one that went T.U. They only kept cars until 100,000 miles, we keep our truck for 10 years or 500,000 kms, so we budget for at least one tranny in the life cycle anyway.
For the individual car owner I would say do it as often as you want, but if you leave it to long don't do it at all.
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