Trim off all the flowers, and trim it downto a neat shape, but always leave some leaves on the shoot you are cutting. Lavender will not sprout from old wood, so if you cut off too much , you will kill it. If it is very old and straggly, maybe consider starting with a new plant, or taking cuttings off of this one to replace it. Cuttings are best taken in June.
You don't stop doing new things because you get old, you get old because you stop doing new things.
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