Objective To investigate the effects of 16 weeks of Tai Chi practice on muscle strength, plantar tactile sensation, kinesthesia, and postural control among older adults of different ages. Methods Thirty-nine older adults were divided into two groups: the 60-75-year-old group (n=24) and the 76-90-year-old group (n=15), and both groups received 16 weeks of Tai Chi practice. The muscle strength, plantar tactile sensation, kinesthesia, and center of pressure root mean square (CoP-RMS) were measured before and after practice. Results After 16 weeks of Tai Chi practice, the fifth metatarsal head tactile sensation and ankle dorsiflexion /plantarflexion kinesthesia thresholds decreased in the 76-90-year-old group, however, there was no significant change in the 60-75-year-old group. The CoP-RMS in the medial/lateral direction decreased in the 60-75-year-old and 76-90-year-old group. Conclusions After 16 weeks of Tai Chi practice, muscle strength, plantar tactile sensation, kinesthesia, and postural control were improved. In addition, Tai Chi practice improved plantar tactile sensation, kinesthesia, and postural control to a greater extent among older adults aged over 75 years. Tai Chi practice provides a suitable and effective exercise form for older adults over 75 years.