until 25 months ago, when was the first time that patient 13329 was prescribed medication via ir?
select prescriptions.startdate from prescriptions where prescriptions.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 13329 ) and prescriptions.route = 'ir' and datetime(prescriptions.startdate) <= datetime(current_time,'-25 month') order by prescriptions.startdate asc limit 1