Hello, here I am providing you the details of the age limits of the IAS exam as under:

General
Maximum Age 32
Attempt 6

OBC
Maximum Age 32+3=35
Attempt 9

SC/ST
Maximum Age 32+5=37
Attempt As many as upto age limit

Physically disabled
(Blind, Deaf-mute, Orthopaedic)
Maximum Age 32+10=42
Attempt If general then 9
OBC then 9
SC/ST- then upto age limit

J&K domicile if general then 32+5=37
Maximum Age OBC then 32+5+3=40
SC/ST then 32+5+5=42
PH then 32+5+10=50
Attempt Depending on above categories viz. Gen, OBC, SC/ST, Disabled

Disabled serviceman discharged from duty
Maximum Age If general then 32+3=35
OBC then 32+3+3=38
SC/ST then 32+3+5=40
Attempt Depending on above categories viz. Gen, OBC, SC/ST, Disabled

Ex-serviceman with five years duty specific condition on page2 of notification
Maximum Age if general then 32+5=37
OBC then 32+5+3=40
SC/ST then 32+5+5=42
Attempt Depending on above categories viz. Gen, OBC, SC/ST, Disabled