Can we draw the following hypothesis from the context? 

Context:

The Portobello Film Festival is an independent international film festival based in London, which annually premiers over 700 new films, including features, shorts, documentaries, music films and animation. Additionally, workshops and talks with top film directors (such as Stephen Frears and John Maybury) are also featured. Admission to the three-week-long festival is free of charge.

Hypothesis: The Portobello Film Festival has been going on for 55 years. 
It's impossible to say