The answer is 86.

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At first, we don't know the decade nor year, but we can stipulate an century. So, consider that the father borned in 1800's. So, we know that an age are measured by: (Actual year - Year born ). Thus, we have, for the father: ( D= dicker number, U= unit number)

1936 - (1800 + D +U) = D + U

136 = 2D + 2U

68 = D + U

So, the father has 68 years old.

Now, for Tommy:

1936 - (1900 + D + Y) = D + U

36 = 2D + 2U

18 = D + U

So, tommy has 18 years.

Thus, the sum of their age is : 68+18 = 86.