Grouping members based on their age

Grouping members based on their age

Hi

I have a list of members, where I have set up a calculated field that calculates the age base on the input of the year of birth. This gives me a list with different ages. However I would like to make a new calculated field that categorize, based on their age, the members into following categories,

0-29
30-39
40-49
50-59
60+

Any idea how this can be done in ZC

Cheers
DC