Living in a 2nd generation community

Our community in Scotland is celebrating its 50th anniversary this year. We took in a group of five new adults and four children a couple of years ago. Despite my personal misgivings about having our children - and their partners and children, return to the community, they’re now full members but with little sense of our historic collective aims and intentions. These were self-sufficiency with a minimal ecological footprint. How do folk in other communities deal with an ageing membership?