Hey Brendan, waiting til I finish. I have my PPL from many years ago (restricted) - only 45 hours or so on C172s, so I have a lot to learn/relearn.
Thanks Nev, guess it's all relative, I'm 54, pretty much the same age Baz is.
Building and flying are 2 different things. @Builds By Baz you're obviously very capable of building things to a high standard and I'm guessing you like doing so, otherwise you wouldn't spend years doing so.
They're right though, it's a good idea to do a TIF at least to ensure you like it before committing.
My only point is that if you enjoy the process of creating something, then you'll probably enjoy making a plane.