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Tough one to answer, everybody's experience with the condition is different.
Early diagnosis and treatment helps a lot.
You can most certainly be happy living with Kallmann syndrome if you are fortunate in finding the right partner early. Some of the physical and psychological issues can make forming relationships difficult for some people with Kallmann syndrome but these can be overcome with time.
Fertility issues can bring pressure on both men and women with KS but there are good treatments available and a high success rate for treatment but it does take a lot of perseverance.