The average age for receiving an inheritance is 40, when many parents are trying to save for and secure the opportunities of higher education for their children, move up to a larger home or one in a better neighborhood, launch a business, switch careers, or perhaps relocate to seek more opportunity.
Considering the overall picture of limited resources for most families that I have described today, I think the effects of inheritances for the sizable minority below the top that receive one are likely a significant source of economic opportunity.