What does it mean to be a kid at heart?
Our biological age does not reflect how we feel. People’s subjective age rather than their objective age accurately predict how young our brain really looks. There is now research that actually backs this up. How young or old you feel reflects how our body ages.
I have a friend that is 78 years young. She drives a motorcycle and has a very active in life.
Being a kid at heart is acting and thinking like a young person. Balancing knowing when to take life seriously and when to have fun. enjoying every stage is about finding something to love in life.
From Pity to Praise 