I sent email to care@irctc and got below response.
Dear Customer,
Please note that wrong input by the customer for the name/age/sex at the time of booking is not permitted to be changed as per extant Railway rules.
Thanks & Regards
Sajid...
more...
Executive, Customer Care
care@irctc.co.in
Ph: 011-39340000
www.irctc.co.in