Source: The following data comes from the Pew Social Media Update 2016 report.
36% of 18 to 29 year olds use Twitter.
23% of 30 to 49 year olds use Twitter.
21% of 50 to 64 year olds use Twitter.
10% of 65+ aged people use Twitter.
If you compare the percentage of Twitter users to the percentage of Facebook users it becomes obvious which platform is used more. It doesn’t mean you shouldn’t be on Twitter, especially if you’re targeting a younger demographic. However, if you’re on a limited budget and have limited time for social media it may be wise to consider other options that come with higher engagement rates.
In regards to gender, the percentage of female vs male users is pretty much split right down the middle. 25% of online women use Twitter where 34% of online men use Twitter. Unlike Facebook, you won’t find a significant difference here.