Kids make friends pretty easily when they go to school and later college. Only after graduating college it becomes very hard to make friends.

So one solution is have folks attend classes in schools and universities or even local libraries during weekends. Classes specifically designed for different age groups - 30s, 40s, 50s etc. Classes related music, personal finance, investing, art, sports, cooking etc

Govt should offer tax breaks for attending these classes. That would attract a lot of people.