Perhaps, the happiness of a child is influenced by the things he discover in life. The first times are so precious- when he learned to use spoon and fork, say "Daddy" and "Mommy", then eventually ride a bike, sing a song or use the toilet bowl. The things he learned at the first time remains in memory.
As we age, we tend to forget to discover many things. The fun has ended. Discovery became a thing in the past. We do things that are normal, routinary and scheduled. What really spices up life is when we discover that we can do something we thought we can't do, experience things we thought we can't experience and have things we thought we can't have.
We still have time to discover more things. Learn how to swim. Taste different coffee flavors. Try spending time on the top of the mountain. Discover great places. Eat mouth-watery and great tasting food. Buy new rubber shoes - or buy your dream shoes. Inspire more people. Volunteer in events helping the poor. Talk about love. Learn more soft skills. Enroll in a music school, or in an art school.
The only person who will hinder us to do such things is ourselves. The question is, "what stops us from discovering more?". Why don't you take time to discover more? Get out of the ordinary life and grab some fun.