If you’re wondering at what age your children or grandchildren will be old enough to handle an inheritance, well, you’re not alone.

U.S. Trust recently conducted a survey of wealthy Americans (with assets of $3 million or more) and asked them that precise question. The issue is important because many parents leave assets in a trust for children or grandchildren until they reach a certain age, so the parents have to choose an age at which to release the funds.

The survey answers varied widely. Here’s a closer look at the results:

Age 18-24: 4%

Age 25-29: 23%

Age 30-34: 37%

Age 35-39: 17%

Age 40 or older: 17%