How much financial help do kids expect from parents?

I want to strike a balance between setting myself up for success and setting my kids up. I dont want them to have to take care of me financially in old age, but also don't want them to feel like I didn't do my job as a parent.

With kids staying home longer and not leaving the nest, it gets me asking myself this question. What is the right balance?

Do i sacrifice saving for my future to fund their college, buy them their first car cash, pay their phone bill, car insurance bill, etc? And if so, until what age? Do i need to pay for their first home's down payment? Pay for their wedding?

Growing up poor my parents didnt do any of this and i got a job at 15 and bought my own car, paid my own way, and i feel its made me the person i am today. I met my spouse when she had children already and I accept the responsibility, just want to know what is reasonable here.