Hmm. We all know we're going to get sick, get old and die - doesn't stop us complaining about that, does it?
I think your standards are unrealistically high with regard to realism, cheerfulness and not moaning.
In fact, I think you do not know what you wish for.
Next time you complain about a cold, or a d and v bug, or your joints getting a bit stiff, or elderly knees and drying out skin, I think a really good friend needs to stand at your elbow and - in a very jolly voice - tell you that it happens to us all, and it's all part of life's rich tapestry, and you must know what you were getting into, and if you don't like it, there's the knife drawer, and we should just learn to embrace all the bits and bobs falling down (or off) because you have to take the rough with the smooth ... and a million other platitudes ...
I reckon you manage ten minutes before standing on their foot to shut them up.
Moaning (in moderation) is what we do in this country. I think it may even be the equivalent of "the evil eye" charms that other cultures have.