PHILADELPHIA — The NFL on Wednesday urged a judge to approve an estimated $1 billion settlement of concussion lawsuits despite concerns raised by former players or survivors who feel left out.

The 65-year fund would resolve thousands of lawsuits that accuse the NFL of long hiding what it knew about concussions and brain injuries.

The NFL now expects 6,000 of nearly 20,000 retired players — or 28 percent — to suffer from Alzheimer’s disease or at least moderate dementia someday. Their average payout would be about $190,000. The awards reach several million dollars for Lou Gehrig’s disease or Parkinson’s disease.

Some critics feel the fund lets the NFL off lightly, given its $10 billion in annual revenues. Others complain that there are no awards for depression, mood swings, dizziness and other problems they link to football concussions.

A chief concern is that the plan leaves out future payments for CTE, which some call the signature disease of football.