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Watching "granny-porn".

Being nice to old people.

Helping an old lady across the street. (there's always a hidden motive)

Having sex with old people.

Special Notes:

It is still considered gentrophilia when an old person has sex with another old person.
by Anonymous June 16, 2003
The uncontrollable desire to have sex with old people
That person's gentrophilia creeps me out.
by Greg October 26, 2002