As I recall you have a proton Satria like this
http://carleasingmadesimple.com/business-car-leasing/proton/satria-neo-hatchback-special-editions/42867/technical-data/
Looks like the recommended timing belt interval is 60,000 miles *or 84 months* which means if yours hasn't been done you're 3 years overdue
The timing belt ensures that the valves open and close at the right time compared to the piston travel. If it breaks then in most cars (of the last 20 years) the pistons will hit the valves and the damage will be extensive and in te case of a cheap car probably more than it's value.
Belts and rubber components will age and temperature variations, exposure to oil and other engine bay contaminants will accelerate that.
I would look into having your timing belt changed if I were you, whilst it's probably going to be a few hundred quid if it breaks you'll be buying a new car