Under the background of the era of digitalization and aging, Internet technology has penetrated into all aspects of the life of the elderly and has had a very important impact on the young elderly who have entered the old age. Based on the data of China Longitudinal Aging Social Survey (CLASS) in 2018, this paper uses the ordered probit model and the mediating effect model to focus the research on the younger elderly group and explores the mechanism of Internet use on the satisfaction of the younger elderly and draws the following conclusions. Firstly, digital applications have a significant impact on the life satisfaction of the younger elderly. Compared with the younger elderly who do not use the Internet, the younger elderly who use the Internet have higher life satisfaction. Secondly, community participation, as an important realization method and measurement index of social participation, plays a partial mediating role in the influence mechanism of digital application on the life satisfaction of young elderly. Thirdly, the influence of the use of the Internet on the life satisfaction of the young elderly with different cultural levels is different, and the life satisfaction of the young elderly with high education is higher than that of the young elderly with low education. Based on theoretical discussion and empirical analysis, this paper puts forward relevant policy suggestions on how to improve the life satisfaction of young elderly.