CBC has recently posted an article, and a series of exercise videos, that older adults can do indoors while practising social distancing (or any time). The first is a fun cardio/strength routine. If you like it, this instructor has many more on his YouTube channel. Feel free to share with others.
The next video addresses balance and shows some exercises you can do to increase balance and decrease the chance of falls.
If you would like to see more and know more, here is the link to the CBC article.