calculation puzzle - Where is Jennifer's husband?

Jennifer is 21 years older than her son Douglas. 6 years from now, Jennifer will be 5 times as old as Douglas.

Question: Where is Jennifer's husband most likely to be right now?

Answer

Let's define $J$=Jennifer and $D$=Douglas.
The problem can be rewritten as:

$J=D+21$
$J+6=5(D+6)$

According to my math, Douglas is $D=(-\frac{3}{4})$ years old, which means $-9$ months. Pregnancy lasts for nine months, so Jennifer's husband is in the bed with her right now.