I agree with you that 5 is really old to still have such poor impulse control. Have you considered that the boy might be mentally handicapped? The lady that sits in front of us at mass has an autistic son and she reads to him or lines up cheerios. I think she goes to mass because she needs it for her sanity.
I am guessing that they go to mass to fulfill their obligation so that they aren’t cast into a furnace of fire where there will be much wailing and grinding of teeth. Mass is a pretty big obligation. Or maybe they are going through some trials as a family and need the grace. You never know unless you ask them.
It’s not always mental illness or a handicap, although I do think we always need to consider that possibility.
In our family, one of my sisters-in-law has three little boys. Back when he was two, one of her boys (a twin, BTW) was diagnosed with cancer. Mom stayed the children’s cancer hospital (over a hundred miles from home) for 150 and nights days with her son, while the other two boys stayed with grandparents and other relatives. Meanwhile Daddy worked double and triple shifts to try to pay the bills that insurance didn’t cover (e.g., gas for the trips up to the cancer center, etc.)
This was incredibly hard for the oldest son, who was around 5 at the time. It definitely delayed his maturing. He suffered major separation anxiety and guilt issues (“Is it my fault that my brother is sick and might die? Did the cancer happen because I hit him once?”). He was angry, but couldn’t express his anger in a “mature” way because he was just a little boy. Instead, he cried and had tantrums. He is by nature a sad little boy, and this terrible incident made him even sadder. (He never smiles in his pictures.)
It was also hard for the younger brother (the healthy twin). He regressed even more dramatically. His tantrums are so bad that his school will call his home and ask that the parents or grandparents come to pick him up. He cries if he is barely touched. He’s extremely intelligent, but has very little control over his impulses. He’s like a three-year old.
Both boys have a very obvious arrested development. Both still sleep with their parents (they are now ages 9 and 7). Neither boy can tie shoes. Both still have 'accidents" and wear pullups at night. (I’m just giving a few examples to demonstrate the lack of maturity.)
In case you are wondering, the little one with cancer survived and appears to be doing well, although he still has a few years to go before being declared “cancer free.” (His form of cancer has a high percentage of re-occurrence.) Not surprisingly, he is the most mature of the three boys–of course he is, because he was never separated from his mother for months. We all think that suffering through the pain of having cancer and being treated has made him stronger and more resilient.
But his brothers have some difficulties, and these difficulties won’t be solved quickly.
My point to telling this story is–we have no idea what children have gone through, and we need to be charitable in our thoughts and actions and not make an unrealistic judgement that “All little ones should be capable of sitting still through a Mass by the time they are five years old.”
Let’s instead pray for little ones who appear to be having a hard time with life, and if it’s appropriate and possible, step in to help out.