Why did Voldemort take 11 years to steal the Philosopher's Stone?

Question

After the first Wizarding War, when Voldemort went to deep Albanian forests to escape from Aurors, why did he take 11 long years to come back to steal the Philosopher’s Stone?

When he acquired Quirrell's body, he immediately went to Gringotts for Philosopher’s Stone.

Why did he wait 11 years to get a human body. He may have found a human body even earlier and would have stolen the Philosopher’s Stone before it is changed to Hogwarts.

Does it have anything to do with Harry Potter entering Hogwarts?

Answer 1

But I dared not go where other humans were plentiful, for I knew the Aurors were still abroad and searching for me. ~GoF, page 567

He was scared of being discovered, and no one crossed his path until Quirrell.

It also seems that possession in this case means sharing a body vs. taking control, as Quirrell acted as his own agent even while "possessed" by Voldemort.

It was coincidence that Quirrell made his trip right before Harry entered Hogwarts.

Answer 2

Quirrell was the chance he had waited for.

The Dark Lord stayed in hiding until he could figure out some way to restore himself to a body. When Quirrell came into the forest where he was hiding, he saw it as the opportunity he was waiting for.

“Then … four years ago … the means for my return seemed assured. A wizard – young, foolish and gullible – wandered across my path in the forest I had made my home. Oh, he seemed the very chance I had been dreaming of … for he was a teacher at Dumbledore’s school … he was easy to bend to my will … he brought me back to this country, and after a while, I took possession of his body, to supervise him closely as he carried out my orders.”
_{^{- Harry Potter and the Goblet of Fire, Chapter 33 (The Death Eaters)}}

Before then, he didn’t want to leave his hiding place, since he’d then risk encountering Aurors in a vulnerable form as either spirit or possessing an animal, as their bodies weren’t suitable to use magic in.