TypeScript is older. It was first released in 2012, whereas Dart was released in 2013.
Dart arrived with much fanfare though, whereas TypeScript was more low-key, and it's taken a while to become mainstream. Google's announcement that Angular 2 would use it has brought it a lot more attention from outside of the traditional MS/.NET dev crowd.
Microsoft have also been shifting the project's focus towards a more Babel-esque one, emphasising greater interoperability with existing (untyped) JS libraries, and support for new ES6/2015 features (and beyond).
Don't know what you're referring to. Dart's release was well past by the time TypeScript debuted.[1] Dart was announced in 2011.[2][3] The only significance that 2013 has to Dart that I know of is that's when Dart 1.0 was released. If that's what we're measuring, TypeScript's 1.0 coincided with Build 2014—still later than Dart's corresponding date, and among other things, that would mean we could say Rust is less than a year old, even though it predates both.
I think Dart and TS will have more or less same audience - and both have their advantages. For me TS is just worse than Dart - not as elegant IMO (all in all - JS superset) and Dart has own VM on server, own consistent packaging system and good non-windows IDE support (Webstorm, IntelliJ).
