English has never remained unchanged. Language changes and develops all the time.
Old English
Swa cwæð eardstapa,
earfeþa gemyndig,
wraþra wælsleahta,
winemæga hryre:
Middle English
Whan that Aprill with his shoures soote
The droghte of March hath perced to the roote,
And bathed every veyne in swich licour
Of which vertu engendred is the flour;
Tudor English
When in disgrace with Fortune and mens eyes,
I all alone beweepe my out-cast state
And trouble deafe heaven with my bootlesse cries,
And look upon my selfe and curse my fate.
Georgian English
Obituary of Adam Smith 1791
Being in his youth a hard student and of a cachectick habit, his appearance was ungracious and his address awkward. His frequent absence of mind gave him an air of vacancy and even of stupidity; and the first day he dined at Balliol College, a servitor seeing him neglect his dinner, desired him to 'fall to', for he had never seen such a piece of beef in Scotland
Modern English
He’s a real nowhere man,
Sitting in his nowhere land,
Making all his nowhere plans
For nobody.
Text speak and abbreviations such as lol, asap, and gosh are examples of the language continuing to develop.