Tax implications if a minor turns 18 years in feb. 2014

A relative turns 18 years on February 3, 2014. Can he file IT Returns for the AY 2014-2015 (FY 2013-2014) as a major for the full financial year 2013-14 or only for the period 3/2/2014 to 31/3/2014?

Kindly advise if the income of the financial year 2013-2014 has to be split into two categories:

1. the income that arises during the period upto 2/2/2014 when he was a minor and this income has to be clubbed with the income of the parent;
2. the income that arises from 3/2/2014 to 31/3/2014 which will be his income as a resident individual (not to be clubbed with the income of the parent).

In the case of a person turning 60 even in February 2014, he will be considered a senior citizen for the full financial year 2013-2014. So, if a child becomes a “major” in February 2014, will he not be a “major” for the full financial year 2013-2014? In this case, there will be significant tax saving as clubbing provisions will not be applicable and the total income will be split into two – that of the parent and that of the son. I will appreciate your opinion alongwith a reference to the applicable section of the Income Tax Act. Thanks.