Thirty (30)

Thirty - an unremarkable number - 10 less than 40,

10 more than 20,

or 1 more than 29.

Cats have exactly 30 teeth.

The minimum age a U.S. Senator has to be is 30.

Months; April, June, September, and November have 30 days in them.

30 years signifies a Pearl Wedding Anniversary.

30 is the second point scored in a game of tennis.

In Back to The Future, Marty McFly traveled 30 years back in time.

30 centimeters equals one foot.

30 is Greece's international calling code. 

There are 30 letters in the Bulgarian alphabet.

30 in Roman numerals is XXX.

In life; your 30's often bring peaking face recognition skills, 

higher-quality friendships, increased self-confidence, and it brings the start of your metabolism slowing down.

30 is the title of a song and an album.

30 is the total number of major and minor keys in Western tonal music.

Judas, in the Bible, allegedly betrayed Jesus in exchange for 30 silver coins.

There are 30 tracks on 'The Beatles‘ The White Album.

The atomic number of zinc is 30.

30 represents the first three prime numbers multiplied (2x3x5).

The number 30 is the sum of the first four square numbers.

There are 30 edges on a dodecahedron.

30 is the sum of the first four squares (1² + 2² + 3² + 4² = 30).

30 is a composite number with 8 divisors (1, 2, 3, 5, 6, 10, 15, 30).

...Turning 30 is a major milestone in life - often symbolizing maturity

for some perhaps,

not all!