That is still young. But big enough that they may be both females. As to whether they pair with an anemone that is a crap shoot. Not all anemones will be to their liking. Each species of clown has a natural host anemone but in captivity they aren't always given their natural host and they don't need an anemone in captivity. I have heard it theorized that captive bred clowns are harder to get to accept an anemone. I have two anemones and one clown. Clown never goes near the anemones.