Older people who exercise regularly fall asleep faster, sleep longer, and report better quality of sleep. Exercise is one of the best things older people can do for their health.

https://www.sleepfoundation.org/aging-and-sleep

Research has shown that older people can take steps to improve their sleep. These steps often involve focusing on improving sleep hygiene and developing habits that encourage quality sleep. 

• Exercise: Older people who exercise regularly fall asleep faster, sleep longer, and report better quality of sleep. Exercise is one of the best things older people can do for their health. 
• Reduce bedroom distractions: Televisions, smartphones, and bright lights can make it more challenging to fall asleep. Keep the television in another room and try not to fall asleep with it turned on. Move electronics out of the bedroom and reserve the bedroom for only sleeping and sex.
• Avoid substances that discourage sleep: Substances like alcohol, tobacco, caffeine, and even large meals late in the day can make sleep more challenging. Consider quitting smoking, reducing caffeine intake, and eating dinner at least four hours before bedtime.
• Keep a regular sleep schedule: Aging can make it more difficult to recover from lost sleep. Avoid sudden changes in sleep schedules. This means going to bed and waking up at the same time every day and being careful about napping too long or too close to bedtime.
• Develop a bedtime routine: Find activities that help you relax before bed. Many older people enjoy taking a warm bath, reading, or finding some quiet time before getting into bed.