Charts and Pilots

[Obi]

Hi,
Just joined and have been readin up a bit on here and now want to ask a question of my own.

Im hoping to set off for the Med from the UK shortly, Ive found a collection of mainly admiralty charts for sale, some 290 in total for biscay to the med, although I dont have the specific details of the what age charts they are all later than 1970..lets assume not updated.
Ive met liveaboards who have been through the med with old charts but I would rather hear some views on this from here before considering a purchase.

I know wrecks appear, sand shifts, harbours change and 1970 is a long time ago etc etc which to me suggests like I should get all new charts.

Any comments?

Thanks
Mark