What do Software Engineers do after the age of 40?

I am always worried about the employment opportunities we would get as software engineers after the age of 40 in India. I am currently 30 and need to plan my retirement financially.. so just trying to understand how the scene is after 40...

I'm a 26-year-old software engineer based in Bangalore, earning ₹25,000 per month after 3.5 years of experience. While my family isn't fully dependent on me at the moment, this situation is temporary (I'd prefer not to go into details). ...