Thirty is:
The number of days in the months April, June, September and November (and in unusual circumstances February - see February 30)
The total number of major and minor keys in Western tonal music, including enharmonic equivalents
The minimum age for United States senators
In years of marriage, the pearl wedding anniversary
The duration in years of the Thirty Years' War - 1618 to 1648.
The code for international direct dial phone calls to Greece
The designation of Interstate 30, a freeway that runs from Texas to Arkansas
The designation of U.S. Route 30, a highway that runs from Oregon to New Jersey
The number of tracks on The Beatles' eponymous album, usually known as The White Album
A stage in young adulthood
Part of the name of:
* 30 Odd Foot of Grunts, the band fronted by actor Russell Crowe
* The movie title 13 Going on 30, starring Jennifer Garner
* The title of the Food Network show 30 Minute Meals
* 30 Days of Night, a comic book miniseries and film.
The uniform number of Maury Wills when he played for the Los Angeles Dodgers.
Judas Iscariot betrayed Jesus for 30 pieces of silver. Matthew 26:15.
The number of the French department Gard
Slang for pornography due to its representation as Roman numeral XXX.
30 was the route number of the bus blown up by terrorists in Tavistock Square during the 7th July 2005 bombings in London
Also my age...
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