The problem with counterfeiting dollars is that it only works until the design is changed and it's hard to transfer your capabilities. On the other hand hacking is convenient since it can be use for political leverage, espionage and similar.
Also, Bitcoin has never had the counterfeiting problem of currency notes, largely because there's no such capacity for bad actors to create or issue counterfeit Bitcoin, as Bitcoin backed by mathematical work that must be performed to in order to mine/"mint" new Bitcoin, unlike US Federal Reserve Notes, which are backed by nothing more than an Intaglio printing press, some engraving plates with publicly-available designs, and 3D security ribbons, ribbons featuring ink that is visible under a blacklight (you can find which chemicals exhibit this property on Wikipedia), some paper, and some linen. Oh, and every single one of those ingredients are are produced by a third party (NOT the US Bureau of Printing and Engraving), who all solemnly pinky promise they don't secretly keep and distribute any extras :)
Humor aside, "When currency is deposited with a Federal Reserve Bank, the quality of each note is evaluated by sophisticated processing equipment. Notes that meet our strict quality criteria--that is, that are still in good condition--continue to circulate, while those that do not are taken out of circulation and destroyed. This process determines the lifespan of a Federal Reserve note."
Not only does the Federal Reserve routinely remove counterfeit notes from circulation, they even routinely remove non-counterfeit notes that are older or have physical damage from circulation!
You'll also find on the source link below, typical lifespans of circulation for various notes, as follows:
Denomination - Estimated Lifespan
$1 - 6.6 years
$5 - 4.7 years
$10 - 5.3 years
$20 - 7.8 years
$50 - 12.2 years
$100 - 22.9 years
So no, nobody is going to bat an eye at a 10-year-old 100-dollar federal reserve note, but by 25 years old, it would be likely to have already been removed from circulation. The 10-year timeframe you mention is more appropriate for $20 and below, but those notes tend to be counterfeited less than larger notes.
Source: https://www.federalreserve.gov/faqs/how-long-is-the-life-spa...
Within the US mostly. Although sometimes you can have trouble with a $2.
Outside the states you might.