What we mean by a person able to work?

Full legal capacity is the ability to exercise rights and to assume obligations, a person who has reached the age of18 years.

by a person able to work we means that now a person"s age has touched the maturity level and he  has mentaly and physically capability to do anything

A person who is able to work means an individual who can flourish his skills easily and utilise his abitlity to think and work efficiently unlike an individual's age.

If you mean legal view I agree with you