ALL laminated bows can "delaminate" at any time, under the right (or maybe wrong) conditions... Even brand new ones!!! I've seen it happen...
One in particular, was a Robinson "Stik-Bow" longbow. At a weekend 3-D event in NewHampsire years ago, a fellow left the bow strung on a picnic table in the shade under the pavillion,while we all were eating dinner. As the hot evening sun started to set,the lower limb became in contact with the sun... It created an "unbalance" in the limbs,and when he drew the bow,it collapsed.
Tha being said, there are ALOT of 1960's and even 1950's bows still in use every day!!!!! Take some simple precautions,and you should be fine!!!
BTW, Ever wonder why these old recurves all look so "beat-up??? They were TOOLS!!!!! Not like todays compounds that are basicly a working piece of machinery... Whatch some old Fred Bear vidios... You will notice Fred using his bow as a "Walking stick" a "Wading staff" and even actualy THROWING them on occasion!!!!! Now you may argue that Fred Bear OWNED the company... and had an "unlimited" supply of bows at his disposal... True, but what many do not know, is that Fred did extensive shelf work to each of his bows,to customize them to his style of shooting!!!!! (He would file down the shelf untill the arrow rested just above his knuckle) It made it "his" bow, and he used "it" untill he needed a new one.
You should be just fine!!! They were meant, to be bent!!!!! ENJOY!!!