1. Green tea: It can reduce blood lipid, blood sugar and blood pressure, and prevent diseases such as Alzheimer's disease and cancer.

2. Daylily tea: It has the effects of clearing away heat and toxic materials, lowering blood pressure and lowering blood sugar.

3. Chrysanthemum tea: It can clear away heat and toxic materials, improve eyesight and relieve pain, and lower blood pressure.

4. Jujube tea: It has the functions of nourishing and strengthening the spleen, nourishing the heart and calming the nerves, enriching the blood and nourishing the face.

5. ginseng tea: it can enhance immunity, improve body resistance and improve the problem of insufficient qi and blood.

6. Mint tea: It has the effects of clearing away heat and toxic materials, relieving summer heat and cooling down, and is suitable for the elderly who are prone to get angry in summer.

Generally speaking, the elderly need to choose a certain kind of tea for health preservation according to their physical condition and needs. It is recommended to consult a professional doctor or Chinese medicine before making a choice.