On what basis is France proposing that it is only recommended for 55 plus?
Pretty much the same basis Macron has used to cast doubt on the vaccines effectiveness in the past.
If you understand that Emmanuel Macron's number one aim is to get reelected above everyone and everything else then you can follow the logic.
Things aren't going too well, he's been a disaster and the incredibly slow pace of procurement, approval and use of vaccinations together with the disgraceful central mismanagement of the whole project (by Von Der Leyen (VDL)) hasn't reflected too well on him personally (even if VDL is principally to blame). As with all countries the economy has had to take a catastrophic hit and the mounting criticism of his premiership is reaching deafening levels.
In France, if everything is falling apart it's a very good idea to deflect by launching an attack on the UK to deflect and show just how much you're on their side. If not a direct attack then one on a company that has English connections.
With his re-election prospects firmly at the forefront of his mind, he's enthusiastically gone down this route with all guns blazing and tried to smash the Anglo-Swedish company Astra Zeneca's Oxford produced vaccine's reputation because his re-election is far, far more important than anything. Saving lives or fighting the greatest crisis since WWIi don't get a look in they're very much secondary, all that matters is getting elected again.
Who can blame him it works, anti English sentiment is a huge vote winner in France, so Macron has wrapped himself in the French tricolour promising to lead France's economic recovery and hit the English hard even as the virus spins out of control,l. Unfortunately the vaccination rate is still painfully slow and the death rate mounting but the good news for Macron is that he miggt get back in again if he keeps these attacks going.
In effect because of his previous spurious and unfounded 'scientific' pronouncements from the great French 'psuedo-scientific'' leader he's effectively limited the AZ vaccine to only the 55-65 age group, even if not by law, and even then it'll face reputational damage so bad that a 70% refusal rate might be expected.
Macron especially, but to a lesser extent Merkel have badly undermined the AZ vaccine, hindered the fight against Covid and been a friend to the grim reaper
Macron has a lot to answer for but his attacks go down well at home, and having reluctantly been forced into reimposing another lockdown in Paris and the north, there's every reason to think he won't stop until reelected.