So would you say that God intentionally misinformed humans as to the age of the Earth? Seems a view unconsistent with a theistic loving God.
Not at all. In fact, creationism aside, we know that God deceives people (see below), and we also know that He is love (1 John 4:8, 16). This might seem inconsistent to some people, but that's not really relevant since what is true isn't determined by how things seem.
12 There is a way that seems right to a man, But its end is the way of death. (Proverbs 14:12)
God's ways are not our ways. In fact, His ways are past finding out and His judgments are unsearchable.
8 "For My thoughts are not your thoughts, Nor are your ways My ways," says the Lord.
9 "For as the heavens are higher than the earth, So are My ways higher than your ways, And My thoughts than your thoughts. (Isaiah 55:8-9)
33 Oh, the depth of the riches both of the wisdom and knowledge of God! How unsearchable are His judgments and His ways past finding out! (Romans 11:33)
God does indeed deceive people, but in general He deceives the wicked and the reprobate, not His own people.
9 And the prophet who is deceived and speaks a word, I the Lord deceived that prophet and will stretch out my hand against him and will cause him to be destroyed from the midst of my people Israel. (Ezekiel 14:9)
11 And for this reason God will send them strong delusion, that they should believe the lie, (2 Thessalonians 2:11)
10 And He said, "To you it has been given to know the mysteries of the kingdom of God, but to the rest it is given in parables, that 'Seeing they may not see, And hearing they may not understand.' (Luke 8:10)
(More examples available upon request.)
So, did God intentionally misinform mankind about the age of the Earth? It's certainly possible, and would be consistent with what we know from the Bible. But the Bible doesn't address that question so we don't know one way or the other. As mentioned above, His thoughts are not our thoughts. In any case, if God did create the universe with the appearance of age, that doesn't obligate Him to tell us that He did so, nor can we justifiably claim to have been deceived for assuming that He didn't do so in the first place.
20 But indeed, O man, who are you to reply against God? Will the thing formed say to him who formed it, "Why have you made me like this?" (Romans 9:20)
The same principle applies to the way He made the universe.