No, there are no more issue than with karate then any other sport.
Learning karate, or participating in any other sport, will not stunt someone's growth. Like all sports and physical activity of all types, there are risks associated with them.
growth problems
A toddler isn't really capable of learning karate. It requires knowledge and understanding, as well as good balance and muscle. Moderate exercise is good at any age and is not likely to affect their growth.
Answer: I'm at a total loss as to why anyone would think karate or any other martial art would stagnate growth. Unless it is run in the form of an ultimate fighting tournament and results in major damage to the person. Martial arts taught by a competent individual should encourage growth.Use of the muscles and tendons, increased flexibility and improved circulation should all benefit the practitioner and cause them to grow and develop muscles and stronger bones.
no
Weathering of any kind can sometimes cause problems, like erosion of topsoil. Biological weathering, where the weathering is caused by living things (plants and animals), can cause the same kinds of problems.
no
It is highly unlikely that neutering would cause any problems in a cat. On the contrary, neutering is said to actually helpcertain behaviour problems such as aggression or spraying.
Not changing the transmission fluid in a car within 200K would cause problems.
Any stress, including bullying, may cause health problems.
There are no age limits in karate. People can start their journey at any age.
A karate instructor is not required to have any academic qualifications.