Possible Clues:

• Foolish folks
• Senile ones
• Dad — sort to get involved with decrepit oldies
• Foolish oldsters
• Doctor's vehicle I lost chasing party idiots
• Doctor Who's vacated time machine I'll leave for buffers
• Aged parties come to the end of 15 across
• Extremely affectionate types showing a way in �
• Some older folks
• The 25 down might point to the peninsula of the North