It is highly relevant to the OP. In fact the entire terms of the reverse mortgage change as you get older since the age is crucial to the whole concept.
With a reverse mortgage, you own a house outright but have no money to keep living with the lifestyle you need/want. So, you borrow a little money each month from your house equity. If you are 40 years old and wanted to do that, you probably don't have enough equity in the house for the idea to work. You'll use up your equity before you die and then you'll owe as much as the house is worth and the FHA would be liable for any losses.
But, if you start at the median age in the mid-70s, you will likely only be borrowing for a decade or so. At a reasonable loan rate of ~$1k per month, you'll likely die or move to a nursing home (or assisted living home or similar) with tons of equity left. Thus, the FHA has almost no chance of losing.