You've probably realised already but it's not like every blogger lists their age or birthdate publicly on their profile, so at least on the internet you needn't worry about such a thing unless you go ahead and declare it every time (or someone goes digging for information on you). The only seemingly obvious tell would be your writing, but I'm confident you'll get better at that over time - you were definitely confident enough to write this post!
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You've probably realised already but it's not like every blogger lists their age or birthdate publicly on their profile, so at least on the internet you needn't worry about such a thing unless you go ahead and declare it every time (or someone goes digging for information on you). The only seemingly obvious tell would be your writing, but I'm confident you'll get better at that over time - you were definitely confident enough to write this post!