If what you’re looking for is alternate phrasing, try these:
it’s relevant to everyday life
it works in daily life
it pertains to ordinary life
it has practical everyday application
it’s useful on a daily basis
If you’re writing a paper, let’s say, and making an argument that some ancient wisdom is still worth studying today, I think you’re right to try to avoid clinical language such as “applicable” and phrase it more in everyday terms.
You might also come at it a different way and say something like “As long as human nature remains constant, ancient truths will have a bearing on our understanding of life.”
Does that help?
A more specific question might elicit a more specific answer.