When you start a life insurance plan you can choose between two types of premium: "rate for age" (also called "stepped") or "level". The difference is simple. Stepped premiums increase every year with age, while level premiums don't increase at all (unless your cover level increases). Level premiums can usually be level until age 65/70/80 - after this they change to rate for age. We show stepped premiums on the LifeDirect site, and it's by far the most commonly chosen option.
The choice between the two comes down to the length of time a person wants to keep their cover. Stepped premiums are much cheaper at the beginning (around half the cost of level cover), but because they increase every year, in the very long term, for example if a person wanted cover through their 70's or beyond, it becomes very expensive. Level cover starts out more expensive (usually double the cost of rate for age), but in the very long term can cost less. You also have certainty around your premiums so it can be much easier to budget for them.