Thirty dream meaning is explained below using 2 different sources. Each interpretation is shown with its source.

Interpretation 1 — myjellybean

In dreams, the number thirty represents high ideals and truth seeking. In some circumstances, dreaming of this number may indicate the dreamer’s jealousy of a friend’s relationship. Thirty can also symbolize a person of high ideals, who is independent, sporty, very honest and sometimes irresponsible.
Source: My Dream Interpretation Author: myjellybean

Interpretation 2 — Vincent Wienand

See Numbers.
Source: Dream Dictionary The Biblical Model Author: Vincent Wienand