Gymnastics tends to not to be as popular after 5 for boys due to the fact they can enroll in a " ball " sport and compete in under 3 months. It generally can take 3-9 months for a boy to be able to compete level 4 at a minimum. Some gyms now compete level 3, so that can decrease time in necessary.
Many boy's program will do less equivalent hours than a girl's program per level.
Learning curve can be easier or more difficult. This has to do with the fact that some events have a lot of crossover ( swinging on p-bars and high bar are similar and slightly similar to rings at the beginning ). However pommel horse and mushroom are not and require more time due to fact it's rhythm based and strength and endurance while requiring more time to learn typically than the other events.
There is very little choreography or dance to learn ( there is some, but nowhere near the girls ) so that does take time for routines.
Honestly, most parents are more interested in seeing their little boy compete and have fun, but of course many parents get ultra competitive at low levels due to that tendency in America.
Boy's have a lot of concentration problems more than girls tend to. That's how their training differs because you train a similar aged girl much more demanding than a boy; most of the time. As well this goes in hand that boy's careers don't start coming into fruition till after puberty and moreso in HS. Thus, you have to keep them interested in the sport until their bodies can really accomplish any of the higher level power necessary in men's gymnastics.
Basically, you can burn out a boy a lot easier than a girl and they tend to have way more opportunities for sport than girls. Often, they will also show interest in a broader range of sports/activities than other girls might. This is where we compete for boy's attention.
