“Middle age is when your broad mind and narrow waist begin to change places.”
E Joseph Cossman

“The young do not know enough to be prudent, and therefore they attempt the impossible, and achieve it, generation after generation.”
Pearl S. Buck

“The older I grow the more I distrust the familiar doctrine that age brings wisdom.”
H. L. Mecken

“By the time you're eighty years old you've learned everything. You only have to remember it.” 
George Burns

Age is an issue of mind over matter. If you don't mind, it doesn't matter.
Mark Twain

A diplomat is a man who always remembers a woman's birthday but never remembers her age.
Robert Frost

Middle age is when your age starts to show around your middle.
Bob Hope

The secret of staying young is to live honestly, eat slowly, and lie about your age.
Lucille Ball

Age is no barrier. It's a limitation you put on your mind.
Jackie Joyner-Kersee

Let us never know what old age is. Let us know the happiness time brings, not count the years.
Ausonius

Age appears to be best in four things; old wood best to burn, old wine to drink, old friends to trust, and old authors to read.
Francis Bacon

Common sense is the collection of prejudices acquired by age eighteen.
Albert Einstein

You don't stop laughing because you grow older. You grow older because you stop laughing.
Maurice Chevalier