I´m not talking about Tom Hanks in Big... This had something to do with a machine used to make tomatoes and pumpkins grow bigger. The boy somehow gets in the machine/ in way of the machine and grows older, then when he turns back a women he got involved with "follows" him back to teen years...

14 Going on 30 (http://www.imdb.com/title/tt0094592/)

Thanks a bunch... not finding the movie was driving me slightly insane

You're welcome.