doddery
adjective mainly UK informal uk/ˈdɒd.ər.i/ us/ˈdɑː.dɚ.i/ (also doddering, /ˈdɒd.ər.ɪŋ/ /ˈdɑː.dɚ.ɪŋ/)
（通常指因年老而）步履蹒跚的，走路摇摇晃晃的
weak and unable to walk in a normal way, usually because you are old
a doddery old man 步履蹒跚的老人
Compare: senilegaga (MENTALLY UNCLEAR)