doddering

/D AA1 D ER0 IH0 NG/
verb
  1. 1

    To shake or tremble as one moves, especially as of old age or childhood; to totter.

noun
  1. 1

    A shaking or trembling movement, as of old age.

adjective
  1. 1

    Mentally or physically infirm due to old age; senile

Source: https://en.wiktionary.org/wiki/dodder, https://en.wiktionary.org/wiki/doddering