Go Figure It Out Yourself!

As Sarah and Mike exchange their wedding vows, a nosy guest asks her date, "Is Mike marrying an older woman?" The man replies:

"Twice Sarah's age, then minus 4 years to equal Sarah's age plus 16 years. Take Mike's age and add 5 years to equal twice Mike's age minus 20 years."

Is Sarah or Mike older, and if so, by how many years?

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