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Experience is the knowledge you have gained in course of your Profession.
This also counts the age (obviously). But, the company/organization has got its own "limitations" in age factor. An Engineer who have got 30 years of "experience" in his profession, may sometimes be super sided by an Engineer who has got less experience, but young by age. That totally depends on the organization, which hire (in most of the cases, the youngster will be given the chance).