Quit Smoking Groups How Old Dou You Have To Be To Join A "quit Smoking* Group?

How old dou you have to be to join a "quit smoking* group? - quit smoking groups

I live in the UK and want a group of NHS stop smoking, but I heard that you must join at least 18 years.
Is that true? If not, age, what are you?
In the 17th btw
Thanks for the answer in advance: D