From the pictures I figure how old people are (6)
I believe the answer is:
images
'from the pictures i' is the definition.
I can't tell whether this definition defines the answer.
'figure how old people are' is the wordplay.
'figure' becomes 'image' ('image' can be a synonym of 'figure').
'how old people are' becomes 's' (I can't explain this - if you can you should believe this answer much more).
'image'+'s'='IMAGES'
Can you help me to learn more?
(Other definitions for images that I've seen before include "Pictures, representations" , "Pictures or photos" , "Likenesses or effigies" , "Likenesses, representations" , "Pictures; metaphors" .)