30 is...
...the running time of Wallace & Gromit's Oscar winning shorts A Close Shave (1995) and The Wrong Trousers (1993)
...the number of features directed by Steven Spielberg from Sugarland Express (1974) to The BFG (2016)
...the age of Bette Davis and Hilary Swank when they won their second Best Actress Oscars for Jezebel (1938) and Million Dollar Baby (2004) respectively
...the year of Best Picture winner All Quiet on the Western Front
... and the age at which you get all dressed up to be "terminated" in Logan's Run (1976). For the good of society!
