The affective commitment is a positive attitude that employees have and demonstrates their loyalty to the company. The company needs to pay attention to influential factors in supporting the form of affective commitment, one of which is High Commitment Human Resource Practices (HCHRP). This research aims to determine the role of age as moderator in the relationship between HCHRP and the affective commitment grouped into Development High Commitment Human Resource Practices (DHCHRP) and Maintenance High Commitment Human Resource Practices (MHCHRP). Data collection was conducted to the employees of ABC Division PT XY (N = 144) and analyzed using multiple regression with moderation analysis. The results showed that the relationship between DHCHRP and affective commitment was strengthened by age, that is, older workers perceived DHCHRP affect the affective commitment stronger than younger workers. Conversely, MHCHRP relationships and affective commitments was weakened by age, i.e. older workers of the MHCHRP perception affect affective commitment weaker than younger workers. Meanwhile, intervention of job crafting training was carried out to improve employee perception on HCHRP, specifically participation which is expected to also increase the employee`s affective commitment. The effectiveness of the intervention was analyzed using Wilcoxon Signed Rank Test. Results of the analysis showed that the knowledge of employees on job crafting increased, but not by their behavior.