This form of dementia tends to occur in relatively younger adults in their 50's or 60's, sometimes earlier and sometimes later. The early degeneration of the front part of the brain leads to distractibility, loss of social etiquette, impairment of language skills, personality changes like obsessive compulsive behaviours and impulsivity, short temperedness or aggression. Paranoid delusions and other psychotic symptoms can occasionally be prominent. As the condition progresses, sexual disinhibition, lack of awareness of self neglect and possible incontinence occurs. Apathy can present as the predominant feature which may be misdiagnosed as a depressive disorder. Memory impairment may not be apparent in the early stages.