There is still confusion between a driving disqualification and the lack of a driving licence.
The lack of a driving licence does not mean you are disqualified from driving. You may not have one because you never applied for one, or it has lapsed, or you are too young to apply. If you drive without one you are not driving whilst disqualified (even if you are prevented from holding one by virtue of your age). You are driving without a licence (or, to give the offence its correct title, “driving otherwise than in accordance with a licence” – DOAL for short). If you are caught you can only be charged with DOAL and the maximum penalty is a fine of £1,000.
Only a court can impose a disqualification following conviction. (As an aside, not many people know that a driving disqualification can be imposed for any offence, not just driving offences. The court must be satisfied that the ban is necessary to prevent further offending. For example, a prolific burglar who drives for his "work" may be disqualified from driving following conviction for burglary).
The reason why courts disqualify people who do not hold a licence, or are too young to hold one is to up the ante. If someone drives who has been disqualified by a court they then can be charged with driving whilst disqualified and the maximum sentence is six months custody.