Yes unfortunately your wife will require reading glasses in the future this due to age related changes as we age after 40+. The clinical term for this change is called Presbyopia.
Everybody at some point experiences the following:
Pulling the arms away to read
Blurring and difficulty focusing at close distance up to 40 cm
Giving up on near visual tasks due to more tired/strained eyes.
ACTION : A pair of reading glasses made to prescription determined by an optometrist is recommend, the prescription will alter after 18-24 months typically. Book an eye test today.