It is illegal for a 70-year-old man to do cleaning work.

Legal analysis: it is not illegal, it is not illegal to hire according to market conditions, and it is illegal to defraud and coerce slavery. Hiring a 70-year-old man to work, the relationship between the old man and the boss belongs to the labor relationship, not the labor relationship. Once an old man is injured at work, he can't enjoy compensation for work-related injuries.

Legal basis: Criminal Law of People's Republic of China (PRC).

Article 17 If a person who has reached the age of 75 intentionally commits a crime, he may be given a lighter or mitigated punishment; Whoever commits a crime negligently shall be given a lighter or mitigated punishment.

Article 49 The death penalty shall not be applied to persons who have reached the age of 75 at the time of trial, except those who cause death by particularly cruel means.

Article 70 A criminal sentenced to criminal detention or fixed-term imprisonment of not more than three years may be suspended if he meets the following conditions at the same time. Among them, those under 18 years old, pregnant women and those over 75 years old are suspended.