I'm excited to hear that you're pursuing your passion in {job/program}, and I'm honored to be considered as one of your recommenders. However, since it's been {amount of time} since you {worked for/with me, took one of my classes, etc.}, I don't think that I would be able to provide an up-to-date endorsement of your skills and experiences.
As someone who reads a lot of recommendations each year, I recommend that you ask a {professor, supervisor, colleague} who is more familiar with your recent work and accomplishments.
I'm sorry to have to decline. Best of luck in your new ventures!
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