Does Klinefelter syndrome affect children differently than adults?

In some boys with Klinefelter syndrome, puberty can be delayed, and the development of muscles and hair can be less than normal. They might be tall and have very long legs. Testicles might also be small, and breast tissue might be enlarged. Some boys might also experience learning and language disabilities, and they might be shy or have low energy levels.
Men with Klinefelter syndrome might be on the tall side, but otherwise, they usually have a normal appearance. They might suffer from both osteoporosis and infertility.