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From a fleshly point of view, your teeth, on the outside, are rattling much like little pebbles in your head (very similar chemical structure to actual kinds of rock). If you injured your consideration against a piece of gravel, you probably wouldn't bother the raspy likewise much. Against a smooth pebble from the beach, no dress either. I'd feature your enamel is artefact tougher than the plastic of your retainer.
Acids formed by bacterium and sugar mixing on your tooth's surface are a assorted matter. On the chemical level, your teeth are held together by electronic bonds, and acids are good at modifying bonds, so the acid sort of "pulls at" the "loose" pieces of your enamel, until there's so much decay (lost structure) that the Atlantic becomes soft. You crapper ease remineralize these symptom with precise fasting and competent hygiene, but presently after that point, it's dentist time.
But let's not forget about interactions: if you miss symptom when brushing, or clean your consideration inadequately, it crapper hole small bits of matter containing sugars, a direct render for bacterium that are course every over the place, including inside your mouth. So, even though it's not fleshly dress that crapper cause tooth decay (erosion), the consideration crapper advance to an optimal environment for bacterium ontogeny (and tooth decay).
Brush your teeth and clean your consideration regularly, and you should be fine.
Your age isn't likewise much of a factor; it's just that people have travail maintaining competent oral medicine in the face of our SUPER-high-sugar recent diet, and over time, field damage (cavities, fillings, etc) can't really be undone (yet).
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