At what age do oak trees produce noticeable quantities of acorns?

Between 50 to 80 years

Explanation:

Oak trees refer to the group of plants which belongs to the beech family of plants. There are about 90 species of Oaks known which are considered the Angiosperms.

Since they are angiosperms, therefore, they produce the flowers and are monecious. The tree produces seeds enclosed in a tough shell called the acorns.

The acorns are produced by the plants after the plant becomes 40-50 years old or they are mature enough to produce acorns. The acorns are produced by the plants in the spring season. The plants can also produce the acorns after they are 30 years old but the noticeable amount is produced after they become 50 years old and produce till they become 80 years old.

Thus, Between 50 to 80 years is correct.