The 21st century is the current century of the Anno Domini era or Common Era, in accordance with the Gregorian calendar. It began on January 1, 2001 and will end on December 31, 2100. It is the first century of the 3rd millennium. It is distinct from the century known as the 2000s which began on January 1, 2000 and will end on December 31, 2099.
A century (from the Latin centum, meaning one hundred; abbreviated c.) is a period of 100 years. Centuries are numbered ordinally in English and many other languages.
In sales, commerce and economics, a customer (sometimes known as a client, buyer, or purchaser) is the recipient of a good, service, product or an idea - obtained from a seller, vendor, or supplier via a financial transaction or exchange for money or some other valuable consideration.
The years of old age are stalls in the cathedral of life in which for aged men to sit and listen and meditate and be patient till the service is over, and in which they may get themselves ready to say "Amen" at the last, with all their hearts and souls and strength.
Weak withering age no rigid law forbids, With frugal nectar, smooth and slow with balm, The sapless habit daily to bedew, And give the hesitating wheels of life Gliblier to play.
John Armstrong, The Art of Preserving Health (1744), Book II, line 484.