They say you're never too old to make a change, and Marie Bila is certainly proof when it comes to iPhone game development.

The 77-year-old Czech granny has been hard at work this year on her physics puzzle iPhone game Gelex, and has been documenting the process on her Granny Coder blog.

PocketGamer.biz has posted an interview with her, finding out why she finally decided to get into game development, how she's finding the experience, and what her three children and five grandchildren think of her new hobby.

As for the game Gelex, she's so enthusiastic about it that she's says sometimes she doesn't have time for anything else - her garden, her 15 chickens, her cat - called Jasmina - or even her goat, Liza.

You can read Why the Granny Coder decided to make her first iPhone game aged 77 on PocketGamer.biz.