What are the best seasons for seniors to travel?

For the elderly travel I think any season is suitable, summer has summer summer places, winter has winter warm places, so suitable or not mainly depends on the travel place.

If it's summer, then we recommend cooler weather and scenic spots, such as Dali and Lijiang in Yunnan, Enshi in Hubei, and Shizhu and Huangshan scenic spots in Chongqing.

If it's winter, I'd recommend Sanya in Hainan, Lianyungang in Jiangsu, and Xiamen in Fujian.