Final answer:
An older client who had chickenpox in childhood would be recommended to receive the shingles vaccine to prevent reactivation of the latent varicella-zoster virus.
Step-by-step explanation:
If a client had chickenpox infection as a child, they carry the varicella-zoster virus in a latent form in their body. As the person ages, their immune system may weaken, increasing the risk of the virus reactivating in the form of shingles. For this reason, the client would be indicated for the shingles vaccine, which is recommended for adults over 60 years old to boost their immune defenses and prevent the reactivation of the virus.