In the 1960s, the fad was to distribute small pieces around the floor. These days, home owners prefer to have one large carpet to define a space. If you like to see small Persian rugs strewn around a room, you may be able to buy them at relatively cheaper prices today. To preserve the value of a Persian piece, proper care is important. Mold from a damp floor is a serious enemy.
Extreme humidity can also weaken an old carpet's fibers.
A dehumidifier can help. In summer, it is a good idea to keep the airconditioner on. Vacuum the rug carefully at least once a week to keep dirt and dust from ruining the colors. Have it washed professionally every few years. That said, your treasure doesn't have to be treated like a museum piece.