There are two categories of young people to mention here. The first is those who travel on school trips or college trips either for an extra curricular activity or as part of an educational visit. The second group are those in late teens or early twenties who have left school or college and are simply traveling for their own enjoyment.
As far as the first category is concerned, young people or children who are staying in hotels will most usually be using either dormitories or shared rooms and are less likely to have individual ones, although this is sometimes the case. It is always important to follow advice and rules provided either by the school or college itself, or by the leaders of the trip, since it is illegally that you will be the only occupants of the hotel. More often than not it may well be the case that a school trip takes place during term time, which is often when people who do not have children choose to book their holiday specifically because there is less chance of children being around.
It is important there before to show consideration and make sure that noise is kept to a minimum, and that after a certain hour your own room is used, and you avoid the temptation of group parties in one particular room. It is also easy to forget that corridors, fire doors and vending machine areas can all help to generate extra noise which can disturb people, particularly those with very young children who may just be going to bed as you return back to the hotel after your day Out.
For those who are in their late teens or early twenties, it is sometimes the case that some hotels do not take bookings for people in that age bracket on their own. This may seem unfair, but is often done to discourage those who may prove to be in some way disruptive to other residents, particularly late at night. This is generally stereotypical, and not necessarily common, but it's worth checking out prior to making your reservation.
It is also worth giving consideration to any age limits or restrictions of alcohol in the country, location or even the hotel itself.
On the positive side however, in some cases there may be discounts for young people, especially those in some kind of education. It is always worth mentioning this when you are making your reservation. However, if you intend to negotiate on the price, do not declare your student discount initially, but ensure that a good price has been agreed and then use your student card to gain a further discount.
Of course, there are types of holiday accommodation specifically geared towards young people, such as hostels, and these can offer a number of advantages, including significantly reduced prices, and facilities which cater more for people of your age. However, the quality of the accommodation is unlikely to compare to that of hotels, and you are more likely to find that noise levels and general activity is greater. This may, of course, prove to be an advantage, depending upon your age and general outlook on life!