Nothing lasts forever — not even 50-cent postage stamps.

The U.S. Postal Service announced that the cost of its Forever stamps will rise five cents apiece on Jan. 27 from 50 cents to 55 cents.

This undated handout image provided by the US Postal Service shows the postage stamp honoring American painter Winslow Homer, featuring his 1874 oil-on-canvas painting "Boys in a Pasture." Associated Press

The 10 percent spike in Forever stamps is the largest price leap since 1991.

Each additional letter ounce will cost an extra 15 cents, which is a decrease from 21 cents. The cost to mail a 2-ounce stamped letter will actually drop from 71 cents to 70 and the cost of a postcard remains fixed at 35 cents.

Priority mail will also rise about 10 percent. A priority small box that once was $7.20 will rise 70 cents, and a priority medium box which previously cost $13.65 will now set you back $14.35.

In 2018, the USPS lost about $3.9 billion – over $1 billion more than the previous year. For 12 straight years, it has been hemorrhaging cash and is not taxpayer-funded. It generates revenue from selling products and services.

The price hikes come amid criticism from President Trump, who referred to the USPS as Amazon’s delivery boy, falsely claiming the online commerce behemoth has cost American taxpayers billions of dollars.

“Why is the United States Post Office, which is losing many billions of dollars a year, while charging Amazon and others so little to deliver their packages, making Amazon richer and the Post Office dumber and poorer?” tweeted Trump in late 2017. “Should be charging MUCH MORE!”

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