Recently more detailed census statistics on religious affiliation have become available. In particular, I was interested in looking at the age and gender of those people.
In the 2023 census it is quite clear that Christian affiliation correlates significantly with age. People in the 25-29 year age group are least likely to be religious, while those over 80 years old are the most likely to be Christian.
Women are also more likely to be Christian than men. The difference between men and women grows with age. While for children the proportions are similar, in old age men are considerably less likely to have a Christian faith.

An interesting pattern can be seen in the early years. It seems that many parents are hesitant to regard their children under 5 years of age as Christians. There are, however, significantly more teenagers that profess to be Christian. Is that because they can decide for themselves and find meaning in church? There are considerably fewer people in their 20s who are Christian. From then on we can say that the older a person is the more likely they are to be Christian. Is that because of changing societal attitudes or because in old age faith has more meaning?

I therefore tracked the changes in overall numbers, rather than percentages.

For those 0-4 years old in 2013, there were more Christians 5 or 10 years later, indicating that as the children grew they have found their own faith. However, for those in their teenage years, Christian faith was significantly lower once they reached their twenties. In turn among the age groups in their twenties or thirties in 2013, their Christian affiliation increased as they came into their 30s and 40s. Later in life, Christian faith decreased again for the age groups. Because this considers overall numbers, it must also be said that those age groups reduce by death. This does indicate that faith is related to life stages. On average, children tend to grow in faith until they get to their late teenage years and twenties, when many lose their faith. As they get older they (re-)gain that faith, only for it to be reduced in the process of aging. The person you are most likely to meet in church is a woman in her fifties—except among the Anglicans; there it is a woman in her sixties.