Older makeup enthusiasts may find that some mascaras become too heavy and irritating as they age. Luckily, all that's needed are a few routine adjustments.

And they start at just $4.

“Eyeliner actually becomes more important as we age,” says pro makeup artist Stevi Christine. “Lashes tend to thin over time, and a liner at the roots helps bring back that youthful fullness.” So, ...