What is the average lifespan of the Audi A3's engine and what type of maintenance should I perform to extend its life?

I'm planning to buy an Audi A3 and I want to know how long its engine typically lasts and what steps I can take to ensure it stays in good condition for as long as possible.

The average lifespan of an Audi A3's engine is around 150,000 miles. To extend its life, make sure to regularly change the engine oil and filter every 5,000 miles and replace the timing belt every 60,000 miles.