There are five reasons for this natural upturn.
1. Time perspective
In most Western societies, we tend to spend our 20s and 30s creating our future. By our late 30s and early 40s, when we realise that a) we have not achieved what we hoped to achieve, and b) our future is shrinking rapidly, we have two options. We can begin to panic, or we can adjust to all these changes by redirecting our thoughts to the positive past. This is what most of us do, which results in us feeling more secure and happier, as we move into the later stages of our lives.
2. Emotional life
When we are young, we let our emotions run wild. The higher they go, the lower they drop. It takes us years to control them. As we move into our 50s, they become more stable and we begin to achieve more serenity in life. Apart from that, we are more drawn to positivity and are able to hold on to it for longer, which is another reason why we feel happier as we age.
3. Social network
In our 20s, our social network is likely to be thriving. We have new people coming into our lives all the time, be it colleagues from a new job, or the extra circles of friends and family of a new romantic partner. Then, as we enter our 30s, it all begins to change. We no longer have the time nor the energy to nurture all our friendships, and people drop from our lives like flies.
Since we need social support to feel happier, this change can have a detrimental effect on our well-being. However, as we move into our 50s, older and wiser, we begin to put more effort into the people in our lives, strengthening our friendships. This can be another reason why we become happier later on in our lives.
4. Life events
Life events are like traffic. When the road is empty, it is easier to drive. As soon as it becomes busy, it is harder to cope. Research shows that both traumatic events and daily hassles are at their highest level when we reach midlife. Thereafter, they begin to slow down, as we learn how to cope with them more effectively. And we become happier as a result.
5. Predictability
It feels good to be able to predict what is going to happen next. It gives us a sense of mastery over our environment and fills us with the confidence that we can tackle anything that life throws at us. As we move along the years, we become better at foreseeing the consequences of our, and other people's, behaviours and become skilled at planning the best action to manoeuvre through life challenges. Each day teaches us new life skills - and they make it easier for us to feel happier.
So it seems our lives do become happier as we age. Ironically, regardless of our age, when people are asked about the happiest times of their lives, they usually point to their 20s, wrongly predicting that feelings of contentment will reduce as they get older.
In fact, it would be a good idea to relax and let nature take its course. Because with things actually improving with age, the uplifting truth is that we all have an ever-increasing chance of living happily ever after.
Jolanta Burke is a senior lecturer in psychology, University of East London.