Yes, of course. I was also thinking about another more or less exceptional case: a woman can give birth quite normally, with less than one year interval. For instance, if two children are born within 11 months, then, during one month every year, the two children will have the same age (when rounded or truncated to an integer).

Also, a man can father children with different women.

It is assumed that the puzzler overlook such possibilities...

>Hi Hilmar,
>
>>The third clue eliminates the combination 6,6,1: the man has ONE oldest son, not twins.
>>
>>Therefore, the ages are 9,2,2.
>
>It is possible that twins are born on different days, so even with twins you have the older one and the younger one.
>
>From: http://www.nomotc.org/library/twinning_facts.html
>
>Superfetation occurs when a women ovulates more than one egg but the eggs are released at different times, sometimes up to 24 days apart, and they are fertilized when they are released. The resulting twin pregnancy has different conception dates, so the babies may be quite different in size. Days or weeks may separate the births. It is quite an unusual event. In some cases, the births of twins may be weeks or months apart due to deliberate medical intervention. This is called interval birth.
>
>So 6,6,1 could be a valid answer <s>
>
>Regards,