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The life expectancy being shorter before modern medicine is missing context. People were more likely to die as infants, but if you made it to age 5, you would most likely live a modern life span of about 80 years, so infant mortality was greater, but if you were to survive past infancy, life expectancy is about the same as it is now.
Doing the thing people are shaming the students are doing in comments. We can’t just judge someone based on their family tree. For any son of a president they’re not going to fit in nicely at a university due to being the son of a president. Hate the president all you want but don’t diss people just because they happen to be related to them.