Every worthy, baptized member is entitled to receive a patriarchal blessing, which provides inspired direction from Heavenly Father. The Church has not set a specific minimum age for receiving a patriarchal blessing. The person should be young enough that many important decisions in life are still ahead. Older adults are also encouraged to receive their patriarchal blessings.

The Church policy is found in the General Handbook, section 18.17:

Every worthy, baptized member is entitled to receive a patriarchal blessing, which provides inspired direction from Heavenly Father (see Genesis 48:14–16; 49; 2 Nephi 4:3–11). Parents and Church leaders encourage members to prepare spiritually to obtain their patriarchal blessings…
 
The person who issues a Patriarchal Blessing Recommend ensures that the member is mature enough to understand the significance and sacred nature of the blessing. Ideally the member should be young enough that many important decisions in life are still ahead. However, older adults are also encouraged to receive their patriarchal blessings. Priesthood leaders should not establish a minimum age for a member to receive a patriarchal blessing.
 
A new convert should understand the basic doctrine of the gospel before receiving a patriarchal blessing.
 
For information about patriarchal blessings in special circumstances, see 38.2.10.

Learn more about patriarchal blessings in the entry “Patriarchal Blessing” in Topics and Questions. Also use the associated study guide.

You can also read about the experiences of several youth who share how they knew the time was right in the article “Ready for My Patriarchal Blessing,” in the August 2023 issue of the For the Strength of Youth magazine.