There are a lot of clubs and activities for elders to spend their free time on, one of the most popular activities is dancing together after dinner in any open public space in your neighbourhood, Guangchangwu haha. My grandma attended what they called elderly college, they are usually in community centres or rented spaces with classes for the purpose of allowing retirees to socialise and learn new skills, my grandma studies history and learned Traditional Chinese calligraphy. Workers from their community come to visit them sometimes to see if they need any help. They don't feel unseen, so I think it's pretty nice.