Dear Listers

I am working with a dataset much like the one you see here.

Code:
* Example generated by -dataex-. To install: ssc install dataex
clear
input float(id pre_event post_event age no_other)
1 3  2 20 1
1 1  0 25 2
1 1  2 29 3
2 0  3 30 1
3 4  1 25 1
4 3  9 28 1
5 5 10 27 1
6 2  2 28 1
7 0  1 26 1
7 4  1 38 2
end
I have counted events for 12 months prior to the event, and 12 months after the event. Let's just say that the event is going on holiday.

pre_event and post_event are the numbers of visits to a specific city.

Now what I want to do:
1) calculate the OR between post_event vs pre_event (using Stata to do it, as I can calculate it fairly easy (OR=ad/bc))
2) i would also like to calculate Incidence Rate Ratio but correct for the age and no_other

I cannot quite wrap my head my head around it, but I know that the exposure time for pre_event is 12months and the exposure time for post_event is 12 months.

hope you can help.
Thanks
Lars