At my home church and in some other churches I've been in the 'usual' age has been about 11 or 12 when children are given the option by their parents whether or not to attend.
In our present church in the past 5 years the age has been 14, 15, or 16 from different families! I don't feel entirely comfortable with 'making' a child attend to this age.
Anyway ds1 is 10 - too young still yet to be allowed to stay home alone. But he is not a christian, he is an atheist, and has been consistently for about 7 years! Very occasionally he professes some slight belief, but not much and not for long. He also says he hates church, hates Sunday School, and doesn't see why he has to go and all his mates get to have a long lie-in.
He often plays-up at Sunday school too, and is a complete pain in the neck for the poor teachers. (It doesn't help that they are fairly right-wing, and ds1 is liable to question the statements they make.)
Obviously ds1 gets bollocked by me whenever specific incidents are reported to me.
Aaarrgghhh.... What to do for the best?