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I think that's because if something's enjoyable, you'll keep on doing it until either it stops being enjoyable or it causes some problem that makes you want to stop despite the enjoyment. By then it's either bad for you and enjoyable or not enjoyable and good for you.

So I think your principle is a long term equilibrium position that things end up in, not really true in the short term.

This principle that "anything that is enjoyable cannot be good for you" is only there I suspect as a cultural leftover of the Catholic religion, I don't think it's a worldwide thing.

So if one were to be in his or her late forties, say, when should one expect it to stop being enjoyable? A friend wanted to know ;)

It depends. A friend knows for certain it can happen.