Age gap between spouses is an important character of marriage.

Age Difference and Second Language Acquisition;

Conclusions of the researches are slightly different,showing the effect of diversity has the characteris-tics of age difference and cross-cultural comparison.

Conclusions:(1) Cognitive training can improve the pupil s self-concept;(2)There is not age differences in training effect;(3) There is not gender differences in training effect.

The results showed: 1) with regard to age differences in the specific memory efficacy, the 60～64 age group and the 65～69 age group rated highest than other groups, and no age differences were found in the above-70 age group and young adults; 2) young adults rated lower than older adults; 3) no age differences were found in the general memory effic.

The present research used SLS model to study the age differences in five primary mental abilities in China and USA.

The aim of the research is to explore the cognitive mechanism of age-related difference in time estimation.

Based on time information processing model,we have made a literature review on age-related difference of time estimation.

The aim of the research is to explore the age-related difference of time estimation in the retrospective paradigm.

Based on calving records(1984-1995)of Holstein-Friesian maintained at one of dairy cattle places in XiNing, used the method of statistieal analysis sex of calf of different breeding age ,parity and breeding month.