In the US, rather the term Longevity Economy is used. It was defined by the AARP as the sum of all economic activity serving the needs of older adults. The global spending power of people 60+ years old is expected to reach $20 Trillion by 2020. Americans over 50 are expected to spend $84 billion annually on tech products by 2030.
The link below provides you a report explaining about the Silver Economy in different continents published by Global Ageing Times.GlobalAgingTimes