Check the syntax

I'm getting the following error messages:
Incorrect syntax near the keyword 'in'.
Server: Msg 156, Level 15, State 1, Line 38
Incorrect syntax near the keyword 'group'.

/* create temp tables */
select distinct d_vst_id as 'DRW_ID'
,d_vst_instid as 'DRW_INSTID'
into temp_tb1
from dnr_vst_db_rec
where d_vst_instid = ''
and d_vst_dontyp = 'WB'
and d_vst_status = 'DN'
and d_vst_date between 20020301 and 20030228
order by d_vst_id

Select distinct
n_per_id as 'ID1'
,n_per_gender as 'GENDER'
,n_per_birth as 'BIRTH1'
,d_bty_abo + d_bty_rhesus as 'ABO1'
,n_adr_city as 'CITY1'
,n_adr_zip as 'ZIP1'
into temp_tb3
from temp_tb1 right outer join nat_per_db_rec
on DRW_ID = n_per_id
right outer join dnr_bty_db_rec
on DRW_ID = d_bty_id
right outer join nat_adr_db_rec
on DRW_ID = n_adr_id
where DRW_INSTID = ''
order by n_per_id

select distinct getdate()
,d_aaa_insthdg
, case (d_vst_btcdte - n_per_birth) / 10000
when in (14,15,16) the '14-16'
when in (17,18,19,20) then '17-20'
when in (21, 22,23,24,25) then '21-25'
when in (26,27,28,29,30) then '26-30'
when in (31,32,33,34,35) then '31-35'
when in (36,37,38,39,40) then '36-40'
when in (41,42,43,44,45) then '41-45'
when in (46,47,48,49,50) then '46-50'
when in (51,52,53,54,55) then '51-55'
when in (56,57,58,59,60) then '56-60'
when in (61,62,63,64,65) then '61-65'
when in (66,67,68,69,70) then '66-70'*/
else
71+
end as 'AGE'
,sum(case a.d_vst_dontyp when '1' then 1 else 0 end ) as 'DRAW1'
,sum(case a.d_vst_dontyp when 'xx' then 1 else 1 end ) as 'TOTAL'
from dnr_aaa_db_rec, dnr_dud_db_rec, temp_tb3, dnr_vst_db_rec a
where a.d_vst_instid = ''
and a.d_vst_instid = d_aaa_instid
and a.d_vst_id = ID1
and a.d_vst_instid = n_per_instid
and a.d_vst_id = n_per_id
and n_per_gender = 'M'
and a.d_vst_btcdte between 20020301 and 20030228
and a.d_vst_btcdte = (Select max(b.d_vst_btcdte)
from dnr_vst_db_rec b
where b.d_vst_instid = ''
and b.d_vst_status = 'DN'
and b.d_vst_dontyp = 'WB'
and b.d_vst_id = a.d_vst_id
and b.d_vst_btcdte between 20020301 and 20030228)

group by
d_aaa_insthdg
,case (d_vst_btcdte - n_per_birth) / 10000
when in (14,15,16) the '14-16'
when in (17,18,19,20) then '17-20'
when in (21, 22,23,24,25) then '21-25'
when in (26,27,28,29,30) then '26-30'
when in (31,32,33,34,35) then '31-35'
when in (36,37,38,39,40) then '36-40'
when in (41,42,43,44,45) then '41-45'
when in (46,47,48,49,50) then '46-50'
when in (51,52,53,54,55) then '51-55'
when in (56,57,58,59,60) then '56-60'
when in (61,62,63,64,65) then '61-65'
when in (66,67,68,69,70) then '66-70'*/
else
71+
end asI think you have 2 problems. First, move (d_vst_btcdte - n_per_birth) / 10000 to be between "when" and "in". Second, in both case statements you have 71+ followed by "*/". You need to surround 71+ with apostrophes and remove */.