I have 1203 records and in each record is a part with the above check box set.
Ouch! Unfortunately, the design choice you made are not optimum choices for such a summary report. If each value in your check box represented a different related record, your summary report would be very easy to produce, but putting all the values in a single field is not nearly so flexible.
One option would be to set up a looping script to copy that data into such a table.
The other approach would be to add 24 more fields to your table. Here's what you would use to count the records with an "Age > 79" value selected:
Define a calculation field, cAgeGT79Flag, with a number result type and this expression:
Not IsEmpty ( FilterValues ( YourCheckboxFieldHere ; "Age > 79" ) )
Define a summary field to compute the total of cAgeGT79Flag
Now repeat that 12 more times...
For a better way to structure such survey or questionnaire type database designs: Need aid on generating a report from a survey layout.