Age Now = Year Now - Year of Birth (if the person has had their birthday this year, and one less if they have not).
So, since we are in 2013 at the time of writing this answer,
79 = 2013 - Year of Birth (if the person has had their birthday this year, and one less if they have not).
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People turning 79 in 2013 were born in 1934.
1931
He bcome 70 year old this year.
1 year = 31,556,926 seconds 31,556,926*79 = 2,492,997,154
2010 - 1931 = 79