I can't remember if it was for my 18th birthday or my high school graduation (I think the latter), but my one aunt -- my mother's sister -- sent me a lovely gift and in the card wrote something about joining the card generation. And that was that. It wasn't a big deal at all. She still got me gifts at other occasions (e.g., baby's birth), but no more birthday or Christmas gifts. I liked the way she handled it. It made me feel like an adult, not a cut-off kid.

In my family, you never stop giving gifts to the younger generation. But then, you also never increase the size of the gift, so inflation has kind of eliminated the financial burden over the decades.

OP here, the plan was once they were done school I would stop, that's why I am unsure what to do.

For example if they didn't attend any post secondary, I would stop right after Highschool.

Maybe this is not smart.

We never started that gift non-sense with our relatives. Makes everyone's lives so much easier all-round.

I received gifts from my aunt until she died, but we had a special relationship. I still give Christmas gifts to my niece who is in college, but stopped giving birthday gifts when they were about 16. Just cards now.
I plan to continue with gifts for awhile but once they are out of college it will revert to either something home cooked if they are local (I make soup and a baked good for local family) or a bottle of wine if they aren't.

Once my nephews graduated high school my SIL said no more gifts. We gave them each money at the beginning of each year of college to help with spending money.

If they say thank you and you have a relationship with them, yes. No thank you and no relationship, no.

Another approach ~ do you get a thank you? If you don't happen to get a thank you - for say 2 years in a row - I would stop sending to that relative regardless of age.

I think to be fair, you need to stop at the same point you stopped for your niece.

I went to grad school for 7 years, and it would have been ridiculous for me to continuing getting cash from aunts and uncles when my cousins the same age were already working.

I am weaning when all in each family are in college. It was fun when they were little and getting toys they really wanted, but now it's just gift cards or money. And they really don't need anything. It would almost be better to donate to some charity in their honor.

Great question. My oldest nephew just graduated from college. Youngest is 1. I don't see an end to this. Definitely by the time they're married.

I think it depends on your budget

In our family you just get a card once you move out of your parents house.

i am 30 and my aunt/uncle still send a birthday gift. whatever works for you.
in your situation i would stop at whatever age you stopped with the first child regardless of school.

In my family, we all give all nieces and nephews $100 for Xmas as well as bdays. Which I know is a lot.

At some point there has to be a stop to this. We kept doing this until the first niece finished four years of college.
Now, next nephew finished his four years of college and went straight to another year of teachers college.
So, do I give for the addition year until he is done school?
Do I end it at the end of the fourth year? ( which finished )