both father and mother are in good health ? 欣聞～，謹祝二老安度晚年。I’m pleased to hear that both your parents are in good health.I wish them a happy life in their remaining years.
椿萱并茂chūn xuān bìnɡ mào
椿：長壽的大椿，用來象征父親；萱：萱草，用來象征母親。大椿和萱草都很茂盛。比喻父母都很健康。both patents are in good health, Both parents are living and in good health.