I really like the SF novel Holy Fire by Bruce Sterling. It beautifully and interestingly dramatises a theme I have not read in any other book: the conflict and contrast between wisdom and (over-)carefulness of old age and the beautiful raw life-force of youth (“holy fire”).
How often do you seen an entirely fresh theme in a book?!
And it is powerfully described in the same character, a very old woman, Mia, who in the late 21st century gets a radical new medical treatment which rejuvenates her to an apparent age of twenty.
And the dense culture of the late twenty-first he describes is delightful.