Cross-Tab: Creating Age ranges in Columns

I have the following formula to convert DOB to age:

if 
//months
(datediff('yyyy',{CDCLIENT.DOB},currentdate)-(if datepart('y',currentdate)>datepart('y',{CDCLIENT.DOB}) then 0 else 1))<2 then
totext(datediff('mm',{CDCLIENT.DOB},currentdate),0,'') & ' months'
else
//years
totext((datediff('yyyy',{CDCLIENT.DOB},currentdate)-(if datepart('y',currentdate)>datepart('y',{CDCLIENT.DOB}) then 0 else 1)),0,'') //& ' years'

Then I created a series of formula (sub-sets) to pre-define my age range

{@age) in "0" to "10" 

and then other formulas for "11-15" and "16-20"

When I insert these in the cross-tab expert, columns it converts each formula into two Columns "True" and "False"

What's the best approach and formula when using a cross-tab? I want the following