I am from India. I am currently doing M.Tech in Biotechnology in a private university. Last year i got placed?

in TCS. My course gets over by May. I am confused as to whether fo join TCS or to go for a PhD in Biotechnology. My parents are asking me to join TCS.But I am scaed because IT may fall down anytime. If I do PhD I have to wait for another 5 years and I will be turning 25 this september. I am confused. Kindlly help. Moreover JOb opportunities in Biotech is very less.