I'm confused, and annoyed (because I don't understand and the Expression Manager wiki isn't basic enough for me)

I would simply like to display a block of text in a group, if the two above questions are answered.
The two questions are: What's your age (DEM_AGE) and What's the stage of life you're in (DEM_LIFE)

I gave the following Relevance Equation for the text block:
[tt]DEM_AGE=>18 and DEM_AGE<=28 and !is_empty(DEM_LIFE)[/tt]

As you can get from above, I only want to display the block to ppl 18,19,...,27,28 years old. It doesn't work; it doesn't display the block.
If I only use [tt]!is_empty(DEM_LIFE)[/tt] it does work, so I guess the 'age' part of my relevance equation is wrong.

(PS. Survey sample files (LSS) don't help me 'cause my university system gives an error when trying to import them)

Found my mistake

[tt]DEM_AGE=>18 and DEM_AGE<=28 and !is_empty(DEM_LIFE)[/tt]
should be
[tt]DEM_AGE>=18 and DEM_AGE<=28 and !is_empty(DEM_LIFE)[/tt]