This paper aims to analyze the influence of national music activities on the long-term care for and happiness of elderly people in the current aging society. Under the popular square dance movement of the whole society, a questionnaire survey was conducted to investigate the differences in the silver-haired body self-esteem and the happiness of the silver-haired exercisers with different exercise methods. Forty first-time square dance participants were selected as experimental objects, and they were divided into an experimental group (ethnic music square dance) and a control group (ordinary music square dance), with 20 people in each group. The results showed that the effective recovery rate of the questionnaire was 95.10% (136/150). There were 47, 45, and 44 people in the square dance, other sports, and non-sport groups, respectively. The total scores of physical self-esteem, physical self-worth, physical quality, health worry, satisfaction and interest in life, control of emotion and behavior, and happiness of silver-haired people who participated in square dance activities were higher than those of other sports players (p < 0.05). The total scores of physical self-esteem, exercise ability, physical condition, and physical quality scores were significantly higher than those of non-sports people (p < 0.01), and each factor and total score on the happiness were higher than those of non-sports people (p < 0.05). The body weight, waist circumference, hip circumference, and thigh circumference of the experimental group after exercise were significantly different from those before exercise (p < 0.01), and the factors of the body self-esteem scale and well-being scale were higher than those before the experiment (p < 0.05). This shows that music has a positive effect on the long-term care for and happiness improvement of the silver-haired family, which can improve the physical and mental health of the silver-haired family and further improve the quality of life of the silver-haired family in their later years. This offers a theoretical basis for the development of the elderly folk music square dance movement in the future and provides a reference for the formulation of silver-haired patriarchal photos and happiness intervention programs.