I seriously don't understand why you're so caught up with the age issue. What difference can it make? I'm guessing you're in a double degree for accountancy and business in NTU and another similar degree in SMU. This means you're good. Coupled with good interpersonal skills and other soft skills like communication, that ONE year difference WILL NOT make a difference.

On the other hand, a lack of confidence, no matter what age you graduate at, will break your career.