With 70k mi. on the clutch, it's definitely on the backside of the hill. But, that doesn't necessarily mean it's at the end of it's service life.
There's really is no absolute mileage benchmark for wear. It depends mostly on how the clutch was used (or abused).
Back in the '80's, I had a turbo-diesel Jetta as a DD and I got 185k mi. out of the original clutch before needing to replace it. On other cars that I've driven more agressively, I've swapped clutches in under 40k mi.
As mentioned, if it's not slipping under 'regular' use, there's likely no need to address it. To some extent, most clutches will exhibit slippage in the scenario you described.
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