Concerning what you read, it's true: REM cycles shorten and quality of sleep lessens with age. But I agree with FryingMan--there is no reason why LDing should cease altogether. When you consider how short the average LD is anyway, a shortened REM cycle is really not that terrifying. And as FM said, his potential for lucidity seems very high, based on recall and vividness of his dreams.
On the other hand, the mind loses its sharpness with age, which unfortunately is just how it is--the body wears itself out. Even old, high-level yogis admit that the clarity is not the same as it was in their youth. That's why we all need to take advantage of the time we have now and use it to the best if our ability.
As for medication, there are many nootropics on the market (including Galantamine), which are aimed at sharpening the mind.
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