Draw length is measured in inches, and its a measurement of how far you pull back the bow. Your draw length is archerys version of your clothing size. Just as clothes get tailored to fit you, the bow you choose must fit your draw length.
Measuring your wingspan is an accurate way to begin finding your draw length.
Unlike a compound, recurve and longbows don't have set draw lengths. However your wingspan is still a valuable guide to what your draw length should be and can be used to select the correct length of bow (longer draw length = longer bow).
Compound bow archers have a slightly easier life as most of today's bow are highly adjustable and certainly once you know your wingspan buying a bow that is adjustable +/- 1" of that should be all you will ever need. *
When you have a proper draw length, you shoot better and feel more comfortable at full draw.
* Difference when measuring for a youth vs adult ...
Within reason an adults draw length will be fairly stable, but when following the above with a growing youth archer, it is important to realise they will unlikely be using the same draw weight and even arrow length, six to twelve months from starting out.
As recurve bows are less adjustable, this potentially means changing limbs as a minimum and although you could buy extra long arrows, keep in mind performance will suffer.
Realistically it is best to base your budget according to how quick you think they will grow along with how much they are likley to practice.
More shooting = quicker advancements and the need for new equipment.
We strongly advise not to rush this process, as a rule, beginners equipment is reasonably priced.
Buying more advanced equipment before an archer is ready can have a reverse effect on progression, saving nothing long term.