If the father is currently 64 years old and he was his son's (let's call him "A") present age when A was born, we can calculate A's current age as follows:
Age of son (A) when he was born = Father's age at that time Age of son (A) when he was born = 64 - A (since the father's age is A when the son was born)
Now, after 10 years, A's age will be: Age of son (A) after 10 years = Age of son (A) at present + 10 Age of son (A) after 10 years = (64 - A) + 10 Age of son (A) after 10 years = 74 - A
Since we don't have the specific age of the son at the time of the question, we cannot provide a precise answer. However, if you know the age of the son at the time of the question, you can substitute that value for "A" and calculate his age after 10 years using the formula above.