Go talk to a doctor, ideally an asthma specialist. If they see something that's a cause for concern, they'll tell you. Chances are though, if you have asthma, your quality of life will be better with some sort of regular asthma management.

Peak flow Means nothing. Just how hard/fast you can breathe into a tube. I consistently fail those tests yet used to run a 16 min 5k and swim a 17 min mile. Goto the doctor and get on a maintenance inhaler to use at night and rescue inhaler like albuterol when you're wheezing.

I was once told by a world renowned pulmonologist that I had a peak flow of an 90 year old women which is about the same as you. I'm not too concerned. I do have a peak flow meter but I rarely test it. However, I am always curious, and with COVID too and the lung damage, how much air VOLUME I can breathe in. At 5 9 5 10, I am about 4500 ml on the following $7 device. Not sure how accurate it is but I like to use it before I run and I find it really helps me to focus on taking a deep breathe to stretch everything out prior to exercise. Almost like dynamic stretching for the lungs.

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As a fellow wheezer, I'd backup what was said earlier by someone else. Go see a doc and ask about about a 'maintenance' (usualy referred to as a 'preventer' here in the UK) like Becotide, or even a combined preventer + reliever.

Whilst I'm sure peak flow doesn't correlate with whether you'll win Kona next year, I do find it is a reasonable indicator / correlates with when my asthma is beginning to 'happen' - before it gets too bad.

My 'normal' is about 650 -670 when 'good'.
6ft tall (183cm)..52 YO. So OK but not exactly stellar.

I think that we can just get accustomed to being sub-par, so we don't recognise that our 'usual' is actually sub-normal (and overall higher fitness levels than Joe Public help mask it).

When mine is (was) down to 500 or 550 I'm still doing everything. Just not quite 100%. I've finally learned that reduction in peak flow is a good the sign I'm heading downhill, so then increase the inhaler use (as the Docs advised) before I'm in a bigger hole.

For info the Doc switched me to a combined preventer + reliever (brand of Fostair) about a year or 2 ago. And I'm way better for it - it seems to stop that initial drop happening (which was exactly why I was changed onto it) - as the regular use of the preventer.... yep ... prevents it !

I still take a Ventolin 'reliever' with me everywhere, esp on sports, just in case. But don't need it much at all these days.

[All the inhalers I'm using are perfectly legit, not on the WADA banned list, and don't need any TUE (there are limits for use- but if I'm at the level of wheezing where I need to exceed the doping limit, I'd not be able to make it anywhere near a start line].