The shopping struggle can be seriously real, but when you enter a new era in your lifetime (we're talking a new decade), it becomes all the more difficult. Why? Because your style is likely to change as you get older, which, in turn, means you won't be shopping at all the same places you did in your early to mid-20s—farewell, Forever 21.

When you reach your 30s, it's more important than ever to build a reliable capsule wardrobe that consists of timeless, classic staples that you can easily wear for both work or play. Not sure where to find said pieces?

You're in luck, then, because below, we've highlighted the seven best places to shop in your 30s, along with our roundup of must-have pieces from each retailer. Ready? Set. Go!

You'll find everything you need at Nordstrom (and just about every brand, too).

From the perfect workwear staples to everyday pieces that are slightly more classic, Nordstrom is a one-stop shop to turn to in your 30s.

If you're ready to spend a bit more on seriously on-trend wardrobe staples, Net-a-Porter is a great place to turn to.

Who doesn't love Mango? The Spanish-based label has the perfect selection of refined, timeless pieces to work into your rotation in your 30s.

Looking for classic pieces that are fun, too? Look no further than Eloquii. Here, you'll find the best vacation dresses as well as the perfect office-friendly blazers.

The pieces you'll find at Aritizia are equal parts trendy, classic, and unique.

Though they're not cheap, they'll last forever.

Much like Aritzia, & Other Stories offers modern pieces that are trendy yet classic at the same time. You'll have so much fun looking through its bountiful selection of pants, shirts, and sweaters.

Though it only launched last year, Verishop has already become one of our favorite online shopping destinations thanks to their curated selection of brands and free one-day shipping.

This is every minimalist's dream come true. COS is the elevated, higher-end sister brand of H&M, and you're bound to fall in love with every piece you lay eyes on.

Next up, I Feel Like a Million Bucks Every Time I Wear This $17 Item, so I'm Buying More

This story was published at an earlier date and has since been updated.