Rahul resides in Bangalore with his extended family, including his parents, grandparents, older brother and younger sister. Rahul successfully obtained his MBA degree from a prestigious business school in 2013. During that year, the collective age of his family members averaged 42 years. In 2015, Rahul entered matrimony, and a year later, he embraced fatherhood. Given that the average age of Rahul's family remained unchanged from 2013 to 2019, and considering that Rahul is four years older than his spouse, what was the age at which Rahul completed his MBA?
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