any difference between these sentences?

[HUFS1999]

Could you help me understand the difference between these sentences?
And I was wondering if both sentences are correct.

Many great books are suitable to read at an early age.
Many great books are suitable to be read at an early age.

Thanx in advance.

[Mohammed Abu Risha]

I can't see any difference.

By the way, should it be better to say: "at early age" rather than "at an early age"?

[sara88]

I don't see any diffrence but I think the second one is better. I hope a native speaker could answer this question.

[eslkorea]

both correct but the second one is more appropriate...