Earlier quoted context omitted.
It all adds up. If you only have a Starbucks on special occasions it isn't much, but some people have daily habits. Likewise a lot of people have the most expensive cable plan which is a lot more money. Phone plans can also get a lot more expensive if you but top of the line phones every couple years.
Ok, could you do the math then? Try to see how many Starbucks coffees you have to forgo to afford a down payment at a median house in the US.
That ignores any interest on the savings. So yeah it seems like "small" regular spending in your 20s (e.g. $100/mo total) can add up to an entire down payment in your early 30s.
Alternatively, assuming your rent would be at least $1000/month, you might live with your parents for an extra 13 months (or fewer for higher rents) before moving out on your own.