Well, good news for you! Soy milk dates all the way back to 1300’s and almond milk to the 1700’s! However, almond milk is awful for environmental reasons, such as too much land and water use. But oat milk is just water and enzymes. We have enzymes in our body and have utilized them in cooking for centuries (like pineapple tenderizing meat).

But also, you’re using things invented in the last hundred years. You’ve been vaccinated for at least a few things. You’re using the internet. You’ve even eaten sliced bread (1928). Stop being obtuse with the whole “last hundred years” crap.