Related Clues:

• Dotty, perhaps
• More than forgetful
• Beyond mere forgetfulness
• Doddering
• In one's dotage
• Deteriorating from old age
• Beyond merely forgetful
• Softheaded
• Lacking marbles?
• Out of it due to age
• Gaga
• Addled by age
• Showing signs of age
• Doting
• Forgetful, in a way