Whatever age you are, there are millions of people the same age (except maybe 104.) So how could your writing be irrelevant?
Sure, the 20-something who has the world figured out and writes about how you can succeed in life probably doesn’t want to read about the life and thoughts of a 60-year old, but other 60 year olds probably do. You just have to convince them to close Facebook, turn off cable news, and start reading Medium. LOL!
As long as your finger work, keep writing.