What is the appropriate age to wean your child off your financial support? And how much money should you give an adult child if any?

We put them through college, bought their first car, and probably the 2nd car as well if they keep adding money in their brokerage account. Since they just graduated and started their job, they are still eligible to contribute Roth, we put $6k into their Roth account. Our plan is to pay them now instead of waiting until we die. We have enough for retirement.