Since you already have the SKIPIF test, I can't see the point of the further IF test. After all, the record will never appear if { MERGEFIELD Boy4 } is empty.

I also can't follow your IF field's syntax; it's spacing and quote characters are all over the place - you either have too many or too few quotes and too few spaces. It should be something like:
{ IF {MERGEFIELD Boy4 }<> "" "Boy Aged 4: {MERGEFIELD Boy4 }" "" }
or, at an absolute minimum:
{IF{MERGEFIELD Boy4}<> "" "Boy Aged 4: {MERGEFIELD Boy4}"}

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]