Human Resource practices are the heart of most organisation for sustaining talented employees. Sustainable manpower is required by any organisation to facilitate productivity, minimise training costs, implement effectiveness of training inputs and cost of production. Organisations can adopt best strategies to overcome competition by effectively participating in CSR activities and creating good organisational image among employees and society. By considering the importance of manpower sustainability in their organisation, the researchers studied the impacts of SHRM on employees' performance for manpower sustainability. The research study involved 100 employees, who were working in a manpower agency of Chennai International Airport at the time of the study. The researchers found that there is a significant association between age of the respondents and their willingness to continue working in the organisation. The researchers also found that 56% of employees aged less than 30 years (44 employees out of 79 employees in that age group) were willing to continue in the organisation for the maximum period of 2 years. This study revealed that there is a significant variance between educational qualification of the employees and their responses that they perform better in the organisation, company inspires them to work towards organizational goal and frequency of supervisors' feedback. This study also revealed that the employees having a bachelors' degree agreed that they were performing better and the superior gives feedback about their performance frequently than the other employees with other qualifications. Meanwhile, compared to other employees of other qualifications, those with post-graduate qualification agreed that the company inspires them to work and they were willing to work to achieve organisational goal. The researchers also found that there is a negative correlation between experience of the employees and their response towards current salary and other packages. This study revealed that the age group of the employees is an important independent variable in predicting the employees' responses towards the manpower agency who recognises their performance.