Earlier quoted context omitted.
> But there are smart people who get all this stuff "easily" (previous practice, exposure). Or, simply by virtue of being more intelligent. Life is not fair, and some people do have it easier than others, without having to pay for it with extra study time. If you are pursuing a research career, and you observe other students putting similar amounts of effort, but obtaining much better results, understanding things mo…
You know it is completely normal to not know things? According to you we should just let old people do everything because they got to spend more time on this planet and never let inexperienced young people do anything even if that means they never gain experience.
Paraphrasing what they said as "According to you we should just let old people do everything" is completely incorrect.
Their comment was more in line with "if your peers, whether younger or older, are learning faster than you, maybe this career is not for you".
That is certainly something to discuss further - but it is not the comment you made it out to be.
Attention to detail is a useful trait to develop.