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On aging for short durations ( up to 20 hours ) , carbide / carbonitride was the dominant transformation product , whereas sigma phase was dominant at longer aging times . Changes in the proportion of the population in cared accomodation between 1998 and 2003 may have had an impact on disability status , particularly for older age groups . The rate of widowhood increases in higher age groups , with more females than males . The fact that definite age trends in increased choices of colored boy were evident from the three-year to the four-year level but , while continuing the trend , were not as definite ( statistically significant ) from the four-year to the five-year level indicates the probability that this technique is inadequate when used with higher age levels . During 2004 , as in previous years , there was a general pattern of decreasing crime rates for persons of older age categories .