Have you linked your Aadhar number with the IRCTC website for booking rail tickets?For booking up to six e-tickets through IRCTC website, no Aadhar verification is required. However, more than 6 tickets and the maximum of 12 e-tickets in a month can be booked by linking the Aadhaar number with IRCTC account.
Also adding Aadhar number in the 'Master List' against passengers name enables the system to recognise the age of the passenger and ask the choice of the passenger to avail concession available for senior citizens or not in eligible cases, at the time of booking of ticket.
It is noteworthy that male passengers of 60 years and above are eligible for 40% concession in fare in all classes and female passengers of 58 years and above are eligible for 50% concession in fare in all classes.
Have you linked your Aadhar number with the IRCTC website for booking rail tickets?