Doing some research on the feasibility of selling a line of products online.
According to Forbes, the seniors (60+ yr olds) global demographic market will have ~$15 Trillion spending power by 2020. It is also the least specifically targeted demo in ecommerce. Most online businesses that target this demo specifically are in the personal mobility (wheelchairs), in-home care service, medications, travel and financial services categories.
Fig 1: US senior facts & figures Data (sourced: Suddenly Senior)
While seniors are a very lucrative market, it is often ignored by software applications because of the unique needs of seniors. It is worth understanding what those challenges are in order to be successful in addressing that market. It is also worth creating ecommerce applications and products that target and address the needs of seniors.
So far, the only large ecommerce company specifically targeting the seniors market is Alibaba’s Taobao in China. Taobao created an ecommerce app specifically for the seniors market. It may be worth researching the case study on how they identified the business opportunity and created a business model to service the seniors market. At a very high level, here are some of the factors that has enabled Taobao to be successful in addressing the seniors market. As with other demographics, focus on the UI/UX.
These senior sites are not necessarily ecommerce sites but they’ll give you an idea
Senior Match: seniormatch.com
Senior Forums: Seniorforums.com
Here are a few others that come to mind:
Mostly sell canes, and products around better mobility and lifestyle.
Here's a write up from x-cart.com, the platform they use and who likes to cite them as a customer success. They've been in business at least ten years and have almost 300k monthly visitors. I'd assume their sales are in the mid-seven to low-eight figures.
UK based site that targets those living with dementia, most of whom are seniors, although I suspect the actual buyers are their family members. Still, technically answers your question.
According to the founder James Ashwell: