Yes, it's alignment problem, maybe too much toe-in, and/or got positive camber (or not enough negative camber). So better flip the tire orientation and do alignment again. No need to change tire yet.

If only judging by thread wear in the photos, yes can still be used. I've used tires until much more worn out than that. But if your tires is already 4yrs old or more, then better change them also since the rubber might already be brittle.