We all get older; not everyone gets wiser.
A wise person has learned: they make fewer of certain kinds of mistake – in particular the predictable, structural kind, the kind based on excessive optimism or pessimism, on folly or vice.
A wise person is learning: they make more of other kinds of mistake – the kind that come from trying new things, and the kind that come from working out how to apply old lessons to new situations.
Which kind of mistake are you making?