Crafting ads for TikTok isn't particularly difficult or expensive, so I'd say it's certainly worth doing if you have the time. I'd urge you to reconsider how you're thinking about TikTok, though. Yes, the audience tends to skew on the younger side, but there are plenty of adults on the platform too. On top of that, if you establish a presence there, you'll have a larger market by the time those younger users grow up. A lot of them will still be on the platform!