def my_categ(data):

    age_groups = [f"{i}-{i+4}" for i in range(0, 100, 5)] 
    grp_data = {}
    for i in range(len(age_groups)):
        start_age = i * 5
        end_age = start_age + 4
        grp_data[age_groups[i]] = data.iloc[:, start_age:end_age+1].sum(axis=1)
    return grouped_data

df['Age Class'] = df['Age'].apply(my_categ)
df

how do I fix this?