No one is going to Barbie's birthday party

If Barbie was a real teenager, she would probably be crying in an empty room with an uneaten birthday cake.

Of course, the real Barbie — the iconic doll — is closer to retirement age. As of Wednesday, the toy is 57 years old, and Mattel has had a hard time keeping her relevant.

While the company does not report brand-specific sales totals every year, it does estimate Barbie and Barbie-related gross sales or percent change in sales going back to 1993. According to figures pulled from company filings, Barbie brand sales are at their lowest point in at least 23 years, and the percentage of Mattel sales coming from Barbie is possibly at an all-time low.

To be sure, Barbie is still a very valuable brand. According to valuation firm Brand Finance, Barbie is worth $476 million (or about 4 percent of Mattel's current market value). The doll is also still frequently at the top of the National Retail Federation's holiday Top Toys list.

The brand just doesn't have the pull it had in the 1990s, when 95 percent of all American girls ages 3 to 11 had at least one Barbie. Sales peaked in 1997 at around $1.8 billion (that would be $2.7 billion in 2016 dollars). It remains to be seen whether the company's recent decision to make major changes to Barbie's much-criticized physique and coloration will boost sales.

Mattel did not respond to a request for comment.

Barbie's waning popularity may not be a disaster for Mattel if those sales can be transferred to other brands like its Monster High dolls. The company's stock is up more than 30 percent in the last year (compared to -4 percent for the S&P 500). But as a powerhouse brand, Barbie may be reaching the end of her reign.