Advice on preserving an old painting The image attached is of a painting which is deteriorating around the edges of the frame. The paint appears to be falking off of the canvas. 

It is between 70 and 80 years old, I don't know what type of paint although I would guess oil. 

Is there anything I can do to prevent further damage?
You should consult a professional conservator.

If you're not even sure what kind of paint was used for this painting, chances are high anything you do'll cause more damage.

A conservator can see what kind of paint was used, what may have caused the damage (moisture, too much tension, deterioration of the paint?) and how to effectively stop the damage from spreading. Usually they would have a look at the painting and give you an estimate of the current value as well as an cost estimate for the preservation or repair before you have to decide whether or not you want to engage them.