Final answer:
The character disapproving of Jane's marriage to Mr. Rochester because of age and class differences is not specified in the excerpts, but in 'Jane Eyre,' society and Lady Ingram express these concerns.
Step-by-step explanation:
The character who disapproves of Jane's marriage to Mr. Rochester in Jane Eyre due to age and social class differences is not clearly specified within the provided excerpts. However, in the context of the novel Jane Eyre by Charlotte Brontë, it is known that society at large and characters such as Lady Ingram express disapproval or doubt about the suitability of the marriage between Jane and Mr. Rochester. The concerns are built upon the significant age difference between Jane and Rochester, as well as the social class disparities, with Jane being a governess and Mr. Rochester being a wealthy landowner.