The new report titled 'Aging Well in Asia' was prepared by Asian Development Bank.
The South Korea and Thailand have achieved universal health coverage.
In Bangladesh, Indonesia and India, more than half of those without access to healthcare are in the bottom two wealth quintiles.
The number of people aged 60 and older in developing Asia and the Pacific is set to nearly double by 2050 to 1.2 billion or about a quarter of the total population.
Others lag behind with India having the lowest health insurance coverage among older people at 21%.
At the same time, these economies have an opportunity to reap a "silver dividend" in the form of additional productivity from older people.
It could boost gross domestic product in the region by 0.9% on average.
Schemes like Ayushman Bharat that provides cashless healthcare to bottom quartile of population has improved health coverage since its launch.
Expanding it further will improve the condition and make people aged over 60 years more productive for the economy.
The share of financially prepared near-old people (those within 5 years or so of retirement) to be as high as 86% in Japan and 73% in India.
But this is somewhat lower at 64% in China and 58% in the Republic of Korea.
Older women in India will see the greatest increase in life expectancy at 6.4 years, followed by Kazakhstan; Georgia; and Hong Kong, China at 4.6 years.
For older men, Armenia will have the highest increase in life expectancy at 6.1 years, followed by India at 5.7 years and Georgia at 5.2 years.