Can old recommendation letters from previous lecturers be used for admission if the latest ones are not available?

Yes, you can use older recommendation letters from previous lecturers if recent ones are not available. Universities understand this, especially if you've been out of academia for a while. While current letters are preferred, older ones are still acceptable and can support your application.

If possible, try to include a recent reference from your workplace or any recent academic/professional contact. Some universities may have specific rules about the age of recommendation letters, so requirements can vary.