I am just curios to know "Upto what age someone can carry on development/coding in India". In US there is no limit as i know few folks in late 50's coding in J2EE space.
There is no limit here either ( to my knowledge ). Many try to tread the managerial path. India lacks good middle level managers ( like project managers ) in the software industry. Many just drop out (of the industry ) due to the frustration of working long hours among other things. They are also expected to take up manager roles as they get older but thats your choice in the end.