Two friends

Two friends met as a good man perish together for a beer. After recovery the most important topics (politics, women, football ...), one asks:
- And how many do you have children?
- I have 3 children.
- And how many years have?
Friend already not want to answer a direct question directly, and then he says:
- The product of their years equals the number 36 and the sum of the years the number of beers we drank here today.
Second to think and says:
- That is not enough!
- You're right, the oldest have bigger ears!


a =  2
b =  3
c =  6


Solution in text c =

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