This was a good movie, but......

what was up with the astronaut being an older Walter?? That part didn't make sense since the movie didn't explain that part. I thought they were copying Jumanji when the kid came back as an adult, but then I thought that there was no younger Robin Williams in Jumanji. He turned time around and went back to being a kid, along with his girlfriend.
I guess the funny part of the astronaut being an older Walter was the Lisa. She totally had a crush on him and when she found out it was her brother, she's like all.... Oh my Gosh and I wanted to.... Then the house blew up or something.

Anyways, I'm in my mid-20's and thought this movie was good, except for the part of the astronaut being an older Walter. What I think they should have done is bring the astronaut's brother back, but him being someone different and then sending him back to 15 years ago.