No you are not consider as senior citizen because you are not 80 year S on 31-3-2019
Income Tax for Super Senior Citizens (Above 80 Years): A super senior citizen is a resident individual (man or woman) who is 80 years old during the previous year (born before April 1st, 1935). The basic exemption limit for very senior citizens (80 years and above) is Rs.3.50 lakh
Very Senior Citizen/ Super Senior Citizen means a resident individual, who is of the age of 80 years or more at any time during the relevant previous year.
For example, an individual born on or before 1 April, 1939 shall be considered as having completed 80 years of age, as on 31 March 2019, for the purpose of getting income tax benefits or status as a ‘super/ very senior citizen’ in respect of FY 2018-19/ AY 2019-20.
for the purposes of the it Act, 'previous year ' means the financial year immediately preceding the assessment year. ... The year in which income is earned is known as 'previous year' and the next year in which it becomes taxable is known as 'assessment year' you will be considered as senior citizen for A.y 20-21 or f.y 19-20 ( still the a.y will be 20-21)