100% an adult. The letter formations are all wrong, and inconsistent. The mistakes are deliberate and not ones that a 6 year old would make. Look at some of the letters like the capital H at the end, the small k etc. You need a high degree of pen control to make those lines, same for the y and gs. Clearly ab adult who probably doesn’t even have a six year old. Tbh I agree with the person who said it was old fashioned writing, this is more of a grandparents age person writing. And agree, a child would never write aged. And they don’t have to pay for school meals.
This person doesn’t even have a child who is 6 in my cynical opinion.