The developer and manager of retirement communities said the pair would oversee the group's building operations and customer-facing services respectively and help deliver the group's new strategy.
The company said Turner would join as chief operating officer in charge of the group's building operations and that Lloyd would be in charge of the group's customer-facing services.
The pair will join the board on 1 January 2019.
"We are delighted to announce these two senior appointments to the board. Nigel and Mike's experience will significantly strengthen our management team and ensure we align our new strategy with operational execution and excellence,” said John Tonkiss, McCarthy & Stone’s CEO said in a statement.