Very different approach teaching a 5 or 13 or 30 year old beginner but basics have to be taught in any subject and at any age.
I work on the premise that all beginners are every bit as clever as I am. The only difference being, I have had a longer time to acquire specific information and apply that knowledge.
After considering what I have to say you can decide for yourself.
Body requirements.
You will be physically using your body to create your Moving Work of Art. Priority will be to understand how a body, yours in particular, is constructed and works. All human bodies are similar but not the same. They are like a jigsaw puzzle. And a lifelong and fascinating pursuit.
Mental Requirements
Your aim is to acquire strength and flexibility, the same as for physical requirements. Developing a good memory, spacial awareness and musical appreciation are essential . Learning to use your eyes and ears constantly and accurately. Minds develop in different ways dependent on nutrition, culture and climate, family influences plus many other factors.
Desire to dance.
Besides the many and varied reasons children and adults attend ballet classes there must be a desire to exert yourself physically and mentally and in time to the music. To repeat and repeat and repeat.
It is not aimed at keeping you fit and losing weight but is superb exercise . It is not a social gathering but dancers do bond with each other.
Time availability
Making sure you have enough time to commit to attending class regularly to achieve a positive outcome.
My Opinion
There is very little difference between teaching an Adult Beginner and a Child Beginner. It is a matter of scale and adapting content to ability in age appropriate manner.
Physically and mentally one has to work carefully and slowly with dancers, steering and guiding them to take control of their own aeroplane as they take flight into dance.