Hope to share some information in case some people didn't know.
Most product has lifespan in terms of TIME too. In this case of timing belt, some have 3-5 years lifespan (usage).
When unused, I "believed" it willd deterrioates too, just much slower.
So, if your car is old, doesn't matter if it has hit 60K or 80K, check your timing belt regularly.
If you just change new ones, make sure the new ones aren't in storage for years or more importantly, they're giving your second hand (in other case, cheat you).

Another thing to look out for is Rubber Hose and Brake Hose, Brake Hose would go faster.
My previous Wira Rubber Hose leaked due to "age", my coolant leaked. Luckily the Air-Cond guy I went to is a very nice and honest person, he help me identify the problem (which is hidden quite deep inside), and tell me that I could have it replace for only few ringgit.
Take care of these "hoses" or "aging" parts, it's a messed when they give way, imagine if it happens on your long journey and in the midnight, worst when something bad happens.

I also experience losing brake fluid completely, luckily I've almost reach my brother's aparment. If it was on the highway...