Final answer:
Mara Becker, the character in "Scythe" by Neal Shusterman who is selected for gleaning by Scythe Faraday, Citra, and Rowan, is 95 years old.
Step-by-step explanation:
The age of Mara Becker, the woman Scythe Faraday, Citra, and Rowan all go to glean in the book "Scythe", is 95 years old. This is a character and scenario found within the first book of the Arc of a Scythe series written by Neal Shusterman.
The book itself is set in a future world where humans have conquered death and scythes are the only ones who can end life in order to maintain population control. In this particular scene, the character Mara Becker is selected to be gleaned to help manage the immortal population.