Wow that is beautiful! Now, even though, "death is nothing to us," you've got to be careful not only to take good care of it but to provide for its continued safety when, many years from now, you have to pass it down to new generations!
The oldest Lucretius (or other book) I have is the John Mason Goode edition from 1805. I have it in a glass case, but I fear you are right that humidity is a big enemy. Let us know what you find out as to how to keep it safe.