How to write 18th birthday wishes
An 18th birthday card is part celebration, part send-off. The person reading it is standing at the edge of adulthood, a little excited and a little scared, so the best messages do two things at once: they cheer, and they reassure. Mention how far they've come since they were small, then point at what's ahead.
If you're a parent, this is the card they may keep for years, so add one sentence only you could write, like a memory from their first day of school. If you're a friend, lean into the fun: the freedom, the road trips, the very questionable first adult decisions. Either way, skip the long list of advice. One good line beats ten rules.