Is there any impact on the life expectancy? How old is the oldest person with a FOXG1 mutation?

The oldest person with a FOXG1 mutation that we know of is 29. As FOXG1 is a neurological disorder, it is inherently life limiting. As there are so few adults diagnosed, we do not have a known life expectancy. FOXG1 itself is not life threatening, but the complications that come from the symptoms (seizures, lung complications due to illnesses, etc) can, in some cases, be problematic.