From September 2020
https://finance.yahoo.com/news/coronavir....

Highlights:
There were only 15 participants included in the report who were over 65 years old.

Participants over 65 years old reported adverse reactions to the drug - like fatigue and muscle aches - at a rate of only 36 per cent.

Younger participants reported those effects at a rate of 64 per cent.

Since the older patients weren't experiencing side effects as often, researchers worry they may not have the same immune response as younger individuals.