Unchanged since age 17:

He’s not someone who shifts in the wind,” Panton says. “The Ted Cruz that I knew at 17 years old is exactly the same as the Ted Cruz I know at 42 years old. He was very conservative then, and an outspoken conservative. He remains strongly conservative today.”
……
The time-capsule quality of Cruz’s politics is lost on no one who knew him at Princeton, none of whom could point to a political position that he held 25 years ago that he does not seem to still hold today. For some, that amounts to a laudably consistent belief system. For others, it reveals a man of calcified thinking, dangerously impervious to facts, reality, and a changing world.