1950 was an outstanding vintage for Port and Madeira. Thge 1950 Port Vintage is renowned for its refined soft wines. They are still drinking exceptionally well today and are highly recommended for a 70th Anniversary or Birthday gift.
For dry reds look towards Bordeaux which was a fabulous vintage that produced rich and full bodied wines. They are however in very short supply and demand is strong.
A 1960 Armagnac would also make a perfect gift for a 60th Anniversary.