The Pompey boss tells fans "don't be worried about his age ... 61 is the new 21".
Harry Redknapp: "Joe Kinnear is not visiting Newcastle to collect a nice little nest egg — don't be shocked if he is still there in 18 months.
Don't Rule Out Kinnear Long Stay!
"One of the criticisms levelled at his appointment as caretaker boss is that he has been out of football for too long during a time when it is undergoing massive transformations, so it does not resemble the game he left behind.
"But the thing that hasn't changed is that supporters are fickle.
"If Joe manages to turn things around and get a few results, the fans will love him.
"If owner Mike Ashley cannot find a buyer for the club for a while and things settle down on the pitch, Joe could well be left to get on with the job for a few months.
"And one thing Joe is good at is motivating players. It was the main weapon in the armoury for the old Wimbledon Crazy Gang under Joe. And look what they achieved.
"Self-belief is the key. Newcastle have a great deal of quality players on the books, unlike the old Dons.
"Joe will have to convince the players to stop feeling sorry for themselves, tell them the owner's problems are not their problems and it is no excuse.
"Sometimes a new face around the corridors can do that.
"And as for him being past it at 61 . . . rubbish. It is the new 21 — and purely a coincidence he's exactly the same age as me!"