the last year, what was the four most common procedures for patients with age 60 or above?
select d_icd_procedures.short_title from d_icd_procedures where d_icd_procedures.icd9_code in ( select t1.icd9_code from ( select procedures_icd.icd9_code, dense_rank() over ( order by count(*) desc ) as c1 from procedures_icd where procedures_icd.hadm_id in ( select admissions.hadm_id from admissions where admissions.age >= 60 ) and datetime(procedures_icd.charttime,'start of year') = datetime(current_time,'start of year','-1 year') group by procedures_icd.icd9_code ) as t1 where t1.c1 <= 4 )