Nevermind, I've used film from 7-12 years old, and the only thing that happens is you lose contrast and color..
Mind you I didn't live in Singapore, so I don't know what the effects of the hot sun will have on the film.
Film has a peak and a fall to the chemical activity, this can be slowed down by keeping it in the fridge. However, in the hot sun it can speed it up.
So 15 years of hot sun, maybe not usable, but I don't think the machine will have problems with the film. As long as it feeds in..
Adam