Fully Comp ins on cars over 10 years of age for under 25's

hi, my son lives in Malta and has put down a deposit on a car today which is a 2000 model, however when he went to sort out insurance he was told that no one in Malta would insure a car over 10 years of age with fully comprehensive insurance.

He is 23 years of age, will be 24 in about 3 weeks.  We are a bit concerned as having visited several times and also having lived in Greece i know how erratic european driving can be and am not happy about him not having fully comprehensive insurance.

I spoke to Atlas who said they wouldn't offer him any cover unless he was a name driver on someone elses policy of if one of his parents had a policy with them which we don't. 

Can anyone tell me if this is true about not getting fully comp on cars over 10 years?

There is another company giving him a quote for 3rd party which his friends use and who don't mind insuring under 25's but if there is a company out there that would give him fully comp we would rather pay more to get this cover as he won't be in a position to repair/replace the car if anything should lord forbid happen. 

Thanks in advance for all advice given.