I grew an apple from a seed as a kid too - it grew in a pot tho and never produced fruit..
Can I be rude and divert to another silly apple question - I've a new tree that I've had 3 years, nothing the first year, a few hard tiny ones the second year and this year they're the size of a golf ball and have turned red but how long til they actually produce full size decent crops?
The one I have is a patio type which supposedly grows millions of fruit on a tiny area and never grows above shoulder height, and it's a Discovery grafted onto whatever the dwarf rootstock is..
I also have a pear, same length of time, and it is still producing nothing other than an odd tiny peanut sized excuse for a fruit

I have a mature cooking apple and plum orchard and even the 2yo damson gave me 9 fruit of normal size this year but I'm obviously not feeding it something it wants?