There is no "legal" age to start professional tennis. However, the ruling bodies of tennis (i.e., ITF, USTA, ATP, and WTA) all have a "player development" program for children and teens, mostly at the grass roots (amateur) level. A discussion on turning pro is available at the USTA website, below.
Already well-known in tennis circles at age 14, Williams turned professional on October 31, 1994
Professional table tennis does not have a required retirement age.
yes
Tennis, rugby, or football.
In order to start a business anywhere, you must be of legal age to sign a contract. That is 18 years of age.
According to Wikipedia (refer to the link, below), Sania Mirza (India) starting playing tennis at the age of six.
Yes the legal age to start working is age 14
They shouldn't until they are of the legal age and a mature age to start driving
She started when she was 2 years old
14
Venus Williams turned professional at the age of 14. She made her debut on the professional tennis circuit in 1994. By the time she was 17, she had already gained significant recognition, marking the beginning of her successful career in tennis.
there are never any age restrictions in table tennis, usually once you are able to see above the table. that would be the perfect time to start