I am very sure, craft.
When do I start paying National Insurance Contributions?
You must pay Class 1 National Insurance Contributions if:
* you work as an employed earner (employee) in the UK,
* you are 16 or over and under State Pension age (currently 60 for women, 65 for men), and
* your earnings exceed a prescribed minimum level, known as the Earnings Threshold (ET).
http://www.hmrc.gov.uk/faqs/nicqc1.htm
You have to pay national insurance contributions while you are working and under pension age, if you earn more than a certain amount called the primary threshold. You do not pay them if you are under 16, and you stop paying them when you are 60 (if you are a woman) or 65 (if you are a man).
http://www.adviceguid...ions_and_benefits.htm