At what age should workers be requested to stop working?

Many people still feel that 65 is a good retirement age, others argue for 70. Even others argue that there should be no age restrictions on working. What do you think? As many people grow older, they become more interested in keeping busy through work. Some employers fear loss of productivity from older workers. A few are fearful that older workers using machinery may be a danger to themselves as well as customers and other employees.

Are there any additional laws or guidelines that can be created to increase the protection of employees against further acts of discrimination?