The best option that expresses the main effect of the description of Dombey and his Son is:
4. The description suggests that Time and Care affect the old and the young alike.
This choice reflects the contrast between Dombey and his Son while emphasizing how both are impacted by Time and Care—Dombey showing the marks of age and experience, while Son, despite being very young, has the potential to be shaped by Time as he grows.