One of the best hours of my life: picnicking by the lake with my husband.
Man I love Evanston in the summer and all the naysayers are in denial.

There are some similarities, but I am against the use of different actors for full-grown adults who are supposed to have a mere 10 year age difference. I know, I know, the two younger ones were at least partially used to attract the some screaming girls into the theaters, but still.3rd case in point:
Wentworth Miller and Anthony Hopkins in "The Human Stain"
Um. People have issues with the casting choice for this movie because this character plays a pale black person, and people think it's impossible to think of Hopkins as black. Well... I think the young/old casting choice is even harder to believe.
EXAMPLES OF GOOD YOUNG/OLD VERSIONS:
That awesome kid and Audrey in "Amelie"

That kid and Ethan Hawke in "Great Expectations"
That kid and Matt Damon in "The Departed"