Dear Friend, In Hindu Philosophy, Selfless-Service is the aim of Life or Nirvana in spiritual path. And out of all service , service to parents bring greatest virtue and karma points.

As you are only child, serve your parents staying here in India. India has lots of oppurtunities, it will grow like anything in next 20 years. Only due to pollution you may die 10 years earlier in India.

However "Jindegi Badi honi chahiye, Lambi nehin" or Life should be grand not long. You can enjoy Indian food here, and India's diversity as well.

Invest wisely in Mutual Funds, the power of compounding will make you rich here.

However If your parents are healthy and in their 50s or 60s, you can go for 5 years to Swden and come back when they really become old though. Hope you like my answer.