I got my social security card when I was around seven. I had a savings account with the Dime Savings Bank of Brooklyn.
Born mid-50’s. I remember I needed my SS# to start a savings account at the S&L in our county seat. My father didn’t have it or the information so I had to wait.
All my siblings except one got them at the same time. We all have consecutive numbers. But not according to age; just randomly distributed amongst the siblings.