50 lakh at 30 is NOT a huge amount for the rest of your life. If you moved to a small town then maybe yes, you can live a low profile life.
But even there, you can’t ignore the costs of medicine in case you fall sick.
Wait, let me do some math, its much easier that way.
Lets say you planning to use this amount till 60. So you have 2 people to feed for 30 years.
Every year you can spend only 1.6 lakh.
Every month it is 13,300 rs between two people.
Now, ignoring all the inflation that is happening, let’s say the costs remain the same for 30 years.
You have mobile bills, fuel/commute,clothes, Gas cylinder, food, basic toiletries and make up.
Also other occasional things like visiting relatives, doctor visits and maybe some furniture update/renewal, vehicle repair and home repair (painting and stuff)
I mean you probably can manage all these things in 13k month today. Its not impossible because people do survive on 13000 a month even though with a very very plain life. But pretty sure in your 50s with more doctor visits, no children to take care of you and costs of things rising it will be impossible or at least not a life you can get if you keep working at google for a few more years.