For the answer to the first question that asks if recent presidents lived longer than presidents from long ago.
Loooking at the spreadsheet, for this part you should be looking at the column labeled age of death as that tells you how long the president lived, I found that the more recent presidents have lived longer lives.
In the next question it asks if presidents were older at their time of inauguration than recent presidents. I found the first several presidents from longer ago were inaugurated at an older age and that seems to be the case with presidents recently (since Roosevelt).
These answers make sense as people who lived long ago had a shorter life span than we do now. This shows why the presidents were elected at a younger age than recent ones as they would have been seen as the wisest when the USA was a young nation and now we recognise that people in their 60s can be very fit. Between these first presidents and recent presidents, generally presidents were in their late 40s or early 50s.