Re: UK Population.

Calorie reduction? It would certainly make your life _feel_ longer.

Their where scientific studies done with rats who where fed vegetarian diets, they concluded it extended their life.

Bumper sticker seen in the USA "Vegetarians don't live longer, it just feels that way"

Well, thats interesting, logical would say that in actual fact the key to things is moderation, almost everything if taken to the extreme can have negative consequences..

AS we are naturally having evolved to eat meat and veg, I would suggest to get peak health we should have a bit of both, too much meat is not healthy, I think.>

Perhaps, but not a hard limit, rather that new memories cause older, less relevant ones to fade. Maybe, after a few centuries, you'd need some kind of artificial extension, especially of the indexing function of the hippocampus but, by that time, it should be available.

The old idea that it's not possible to recruit new neurons to the CNS of an adult has been discredited.

That would be the optimistic view, but ISTM it might just as easily be that the memories start overlaying each other and you get progressively more confused, or that you keep the older memories but can't lay down new ones. As I say, it seems remarkable to me anyway that the brain can cope with 100+ years of memories, it's hard to see how evolution would have explicitly selected for it so it's more likely to be a side-effect, in which case there's no reason to be particularly optimistic that it would degrade gracefully if you lived to be 200.